[llvm] [gn build] Port c3792d66d2c1 (PR #215955)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ml-opt-devrel-x86-64` running on `ml-opt-devrel-x86-64-b1` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/175/builds/890

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
23.822 [3761/2/419] Creating library symlink unittests/CAS/libCASPluginTest.so
23.826 [3761/1/420] Linking CXX executable bin/llvm-min-tblgen
23.982 [3726/35/421] Building TargetLibraryInfo.inc...
23.982 [3726/34/422] Building Attributes.inc...
23.982 [3726/33/423] Building GenVT.inc...
24.013 [3725/33/424] Building OMP.h.inc...
24.034 [3725/32/425] Building ACC.h.inc...
24.062 [3725/31/426] Building ACC.inc...
24.065 [3724/31/427] Building OMP.inc...
24.116 [3724/30/428] Building CXX object lib/CodeGenTypes/CMakeFiles/LLVMCodeGenTypes.dir/LowLevelType.cpp.o
FAILED: [code=1] lib/CodeGenTypes/CMakeFiles/LLVMCodeGenTypes.dir/LowLevelType.cpp.o 
ccache /usr/bin/c++ -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/b/ml-opt-devrel-x86-64-b1/build/lib/CodeGenTypes -I/b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/lib/CodeGenTypes -I/var/lib/buildbot/.local/lib/python3.7/site-packages/tensorflow/include -I/b/ml-opt-devrel-x86-64-b1/build/include -I/b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Xclang -fno-pch-timestamp -O3 -DNDEBUG -UNDEBUG -fno-exceptions -funwind-tables -fno-rtti -std=c++17 -Winvalid-pch -Xclang -include-pch -Xclang /b/ml-opt-devrel-x86-64-b1/build/lib/Support/CMakeFiles/LLVMSupport.dir/cmake_pch.hxx.pch -Xclang -include -Xclang /b/ml-opt-devrel-x86-64-b1/build/lib/Support/CMakeFiles/LLVMSupport.dir/cmake_pch.hxx -MD -MT lib/CodeGenTypes/CMakeFiles/LLVMCodeGenTypes.dir/LowLevelType.cpp.o -MF lib/CodeGenTypes/CMakeFiles/LLVMCodeGenTypes.dir/LowLevelType.cpp.o.d -o lib/CodeGenTypes/CMakeFiles/LLVMCodeGenTypes.dir/LowLevelType.cpp.o -c /b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/lib/CodeGenTypes/LowLevelType.cpp
error: PCH file '/b/ml-opt-devrel-x86-64-b1/build/lib/Support/CMakeFiles/LLVMSupport.dir/cmake_pch.hxx.pch' built from a different branch ((++20260714014842+ca7933e47d3a-1~exp1~20260714134950.86)) than the compiler ((1~deb12u1))
1 error generated.
24.128 [3724/29/429] Building RuntimeLibcalls.inc...
24.839 [3724/28/430] Building IntrinsicsRISCV.h...
24.854 [3724/27/431] Building IntrinsicsR600.h...
24.905 [3724/26/432] Building IntrinsicsSPIRV.h...
24.913 [3724/25/433] Building IntrinsicsAVR.h...
24.927 [3724/24/434] Building IntrinsicsLoongArch.h...
24.933 [3724/23/435] Building IntrinsicsXCore.h...
24.960 [3724/22/436] Building IntrinsicEnums.inc...
24.987 [3724/21/437] Building IntrinsicsAArch64.h...
25.000 [3724/20/438] Building IntrinsicsARM.h...
25.012 [3724/19/439] Building IntrinsicsWebAssembly.h...
25.044 [3724/18/440] Building IntrinsicsS390.h...
25.075 [3724/17/441] Building PPCGenTargetFeatures.inc...
25.084 [3724/16/442] Building IntrinsicsDirectX.h...
25.085 [3724/15/443] Building IntrinsicsMips.h...
25.114 [3724/14/444] Building IntrinsicsNVPTX.h...
25.141 [3724/13/445] Building IntrinsicsAMDGPU.h...
25.162 [3724/12/446] Building R600TargetParserDef.inc...
25.171 [3724/11/447] Building IntrinsicsVE.h...
25.194 [3724/10/448] Building IntrinsicsBPF.h...
25.195 [3724/9/449] Building IntrinsicsPowerPC.h...
25.223 [3724/8/450] Building IntrinsicImpl.inc...
25.261 [3724/7/451] Building IntrinsicsHexagon.h...
25.268 [3724/6/452] Building IntrinsicsX86.h...
25.274 [3724/5/453] Building ARMTargetParserDef.inc...
26.041 [3724/4/454] Building CXX object lib/Frontend/OpenACC/CMakeFiles/LLVMFrontendOpenACC.dir/ACC.cpp.o
26.060 [3724/3/455] Building AArch64TargetParserDef.inc...
28.393 [3724/2/456] Building RISCVTargetParserDef.inc...
39.908 [3724/1/457] Building AMDGPUTargetParserDef.inc...
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/215955