[llvm] [SelectionDAG][NFC] Add function for `peekThroughFreeze` (PR #195324)

Sun May 3 10:35:48 PDT 2026

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-aarch64-darwin` running on `doug-worker-4` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/41908

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (build-unified-tree) failure: build (failure)
...
718.635 [2207/14/4324] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/ICF.cpp.o
719.044 [2206/14/4325] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/DriverUtils.cpp.o
719.072 [2205/14/4326] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/LLDMapFile.cpp.o
719.118 [2204/14/4327] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/MarkLive.cpp.o
719.143 [2203/14/4328] Building Options.inc...
719.173 [2202/14/4329] Building Options.inc...
719.204 [2201/14/4330] Building Options.inc...
719.227 [2200/14/4331] Building Options.inc...
719.239 [2199/14/4332] Building CXX object lib/ObjCopy/CMakeFiles/LLVMObjCopy.dir/ELF/ELFObject.cpp.o
719.247 [2198/14/4333] Linking CXX static library lib/libclangCodeGen.a
FAILED: [code=1] lib/libclangCodeGen.a 
: && "/Library/Developer/CommandLineTools/usr/bin/libtool" -static -no_warning_for_no_symbols -o lib/libclangCodeGen.a  tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/ABIInfo.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/ABIInfoImpl.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/BackendUtil.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGAtomic.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGBlocks.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGBuiltin.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGCUDANV.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGCUDARuntime.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGCXX.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGCXXABI.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGCall.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGClass.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGCleanup.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGCoroutine.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGDebugInfo.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGDecl.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGDeclCXX.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGException.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGExpr.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGExprAgg.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGExprCXX.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGExprComplex.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGExprConstant.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGExprScalar.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGGPUBuiltin.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGHLSLRuntime.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGHLSLBuiltins.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGLoopInfo.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGNonTrivialStruct.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGObjC.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGObjCGNU.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGObjCMac.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGObjCRuntime.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGOpenCLRuntime.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGOpenMPRuntime.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGOpenMPRuntimeGPU.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGPointerAuth.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGRecordLayoutBuilder.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGStmt.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGStmtOpenMP.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGVTT.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGVTables.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CodeGenABITypes.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CodeGenAction.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CodeGenFunction.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CodeGenModule.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CodeGenPGO.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CodeGenSYCL.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CodeGenTBAA.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CodeGenTypes.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/ConstantInitBuilder.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CoverageMappingGen.cpp.o tools/clang
Gen.dir/HLSLBufferLayoutBuilder.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/LinkInModulesPass.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/MacroPPCallbacks.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/MicrosoftCXXABI.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/ModuleBuilder.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/ObjectFilePCHContainerWriter.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/PatternInit.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/QualTypeMapper.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/SanitizerMetadata.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/SwiftCallingConv.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/ARM.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/AMDGPU.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/DirectX.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/Hexagon.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/NVPTX.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/PPC.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/RISCV.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/SPIR.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/SystemZ.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/WebAssembly.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/X86.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetInfo.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/AArch64.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/AMDGPU.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/ARC.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/ARM.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/AVR.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/BPF.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/CSKY.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/DirectX.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/Hexagon.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/Lanai.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/LoongArch.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/M68k.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/MSP430.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/Mips.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/NVPTX.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/PPC.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/RISCV.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/SPIR.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/Sparc.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/SystemZ.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/TCE.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/VE.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/WebAssembly.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/X86.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/XCore.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TrapReasonBuilder.cpp.o tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/VarBypassDetector.cpp.o && cd /Users/buildbot/buildbot-root/aarch64-darwin/build/tools/clang/lib/CodeGen && touch /Users/buildbot/buildbot-root/aarch64-darwin/build/./lib/libclangCodeGen.a
/Library/Developer/CommandLineTools/usr/bin/libtool: warning duplicate member name 'AMDGPU.cpp.o' from 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/AMDGPU.cpp.o(AMDGPU.cpp.o)' and 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/AMDGPU.cpp.o(AMDGPU.cpp.o)'
/Library/Developer/CommandLineTools/usr/bin/libtool: warning duplicate member name 'ARM.cpp.o' from 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/ARM.cpp.o(ARM.cpp.o)' and 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/ARM.cpp.o(ARM.cpp.o)'
/Library/Developer/CommandLineTools/usr/bin/libtool: warning duplicate member name 'DirectX.cpp.o' from 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/DirectX.cpp.o(DirectX.cpp.o)' and 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/DirectX.cpp.o(DirectX.cpp.o)'
/Library/Developer/CommandLineTools/usr/bin/libtool: warning duplicate member name 'Hexagon.cpp.o' from 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/Hexagon.cpp.o(Hexagon.cpp.o)' and 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/Hexagon.cpp.o(Hexagon.cpp.o)'
/Library/Developer/CommandLineTools/usr/bin/libtool: warning duplicate member name 'NVPTX.cpp.o' from 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/NVPTX.cpp.o(NVPTX.cpp.o)' and 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/NVPTX.cpp.o(NVPTX.cpp.o)'
/Library/Developer/CommandLineTools/usr/bin/libtool: warning duplicate member name 'PPC.cpp.o' from 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/PPC.cpp.o(PPC.cpp.o)' and 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/PPC.cpp.o(PPC.cpp.o)'
/Library/Developer/CommandLineTools/usr/bin/libtool: warning duplicate member name 'RISCV.cpp.o' from 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/RISCV.cpp.o(RISCV.cpp.o)' and 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/RISCV.cpp.o(RISCV.cpp.o)'
/Library/Developer/CommandLineTools/usr/bin/libtool: warning duplicate member name 'SPIR.cpp.o' from 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/SPIR.cpp.o(SPIR.cpp.o)' and 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/SPIR.cpp.o(SPIR.cpp.o)'
/Library/Developer/CommandLineTools/usr/bin/libtool: warning duplicate member name 'SystemZ.cpp.o' from 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/SystemZ.cpp.o(SystemZ.cpp.o)' and 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/SystemZ.cpp.o(SystemZ.cpp.o)'
/Library/Developer/CommandLineTools/usr/bin/libtool: warning duplicate member name 'WebAssembly.cpp.o' from 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/WebAssembly.cpp.o(WebAssembly.cpp.o)' and 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/WebAssembly.cpp.o(WebAssembly.cpp.o)'
/Library/Developer/CommandLineTools/usr/bin/libtool: warning duplicate member name 'X86.cpp.o' from 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/Targets/X86.cpp.o(X86.cpp.o)' and 'tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/X86.cpp.o(X86.cpp.o)'
fatal error: /Library/Developer/CommandLineTools/usr/bin/libtool: can't write to output file (No space left on device)
719.254 [2198/13/4334] Linking CXX static library lib/libclangRewriteFrontend.a
719.372 [2198/12/4335] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/DebugTypes.cpp.o
719.473 [2198/11/4336] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/DLL.cpp.o
719.653 [2198/10/4337] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/MapFile.cpp.o
719.720 [2198/9/4338] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/MinGW.cpp.o
720.373 [2198/8/4339] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/LTO.cpp.o
720.423 [2198/7/4340] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/Symbols.cpp.o
720.851 [2198/6/4341] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/PDB.cpp.o
721.157 [2198/5/4342] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/InputFiles.cpp.o
721.609 [2198/4/4343] Building CXX object tools/clang/lib/ExtractAPI/CMakeFiles/obj.clangExtractAPI.dir/ExtractAPIConsumer.cpp.o
721.772 [2198/3/4344] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/SymbolTable.cpp.o
721.792 [2198/2/4345] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/Driver.cpp.o
723.048 [2198/1/4346] Building CXX object tools/lld/COFF/CMakeFiles/lldCOFF.dir/Writer.cpp.o
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/195324