[llvm] [profcheck] Add unknown branch weights to expanded cmpxchg loop. (PR #165841)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lld-x86_64-ubuntu-fast` running on `as-builder-4` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/33/builds/25998

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
                 from /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/VE/VEISelLowering.h:18,
                 from /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/VE/VESubtarget.h:17,
                 from /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/VE/LVLGen.cpp:10:
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/include/llvm/CodeGen/LibcallLoweringInfo.h:15:46: warning: ‘visibility’ attribute ignored [-Wattributes]
   15 |   LLVM_ABI const RTLIB::RuntimeLibcallsInfo &RTLCI;
      |                                              ^~~~~
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/include/llvm/CodeGen/LibcallLoweringInfo.h:18:25: warning: ‘visibility’ attribute ignored [-Wattributes]
   18 |       RTLIB::Unsupported};
      |                         ^
14.272 [1156/64/2871] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/AtomicExpandPass.cpp.o
FAILED: lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/AtomicExpandPass.cpp.o 
CCACHE_CPP2=yes CCACHE_HASHDIR=yes CCACHE_SLOPPINESS=pch_defines,time_macros /usr/bin/ccache /usr/bin/c++ -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/build/lib/CodeGen -I/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/CodeGen -I/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/build/include -I/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-dangling-reference -Wno-redundant-move -Wno-pessimizing-move -Wno-array-bounds -Wno-stringop-overread -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/AtomicExpandPass.cpp.o -MF lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/AtomicExpandPass.cpp.o.d -o lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/AtomicExpandPass.cpp.o -c /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/CodeGen/AtomicExpandPass.cpp
In file included from /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/include/llvm/CodeGen/TargetLowering.h:32,
                 from /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/CodeGen/AtomicExpandPass.cpp:24:
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/include/llvm/CodeGen/LibcallLoweringInfo.h:15:46: warning: ‘visibility’ attribute ignored [-Wattributes]
   15 |   LLVM_ABI const RTLIB::RuntimeLibcallsInfo &RTLCI;
      |                                              ^~~~~
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/include/llvm/CodeGen/LibcallLoweringInfo.h:18:25: warning: ‘visibility’ attribute ignored [-Wattributes]
   18 |       RTLIB::Unsupported};
      |                         ^
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/CodeGen/AtomicExpandPass.cpp: In static member function ‘static llvm::Value* {anonymous}::AtomicExpandImpl::insertRMWCmpXchgLoop(llvm::IRBuilderBase&, llvm::Type*, llvm::Value*, llvm::Align, llvm::AtomicOrdering, llvm::SyncScope::ID, llvm::function_ref<llvm::Value*(llvm::IRBuilderBase&, llvm::Value*)>, llvm::CreateCmpXchgInstFun, llvm::Instruction*)’:
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/CodeGen/AtomicExpandPass.cpp:1694:56: error: could not convert ‘* F’ from ‘llvm::Function’ to ‘llvm::StringRef’
 1694 |   setExplicitlyUnknownBranchWeightsIfProfiled(*CondBr, *F, DEBUG_TYPE);
      |                                                        ^~
      |                                                        |
      |                                                        llvm::Function
14.273 [1156/63/2872] Building CXX object lib/Target/VE/CMakeFiles/LLVMVECodeGen.dir/VEAsmPrinter.cpp.o
14.273 [1156/62/2873] Building CXX object lib/Target/VE/CMakeFiles/LLVMVECodeGen.dir/VECustomDAG.cpp.o
In file included from /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/include/llvm/CodeGen/TargetLowering.h:32,
                 from /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/VE/VEISelLowering.h:18,
                 from /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/VE/VECustomDAG.h:18,
                 from /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/VE/VECustomDAG.cpp:14:
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/include/llvm/CodeGen/LibcallLoweringInfo.h:15:46: warning: ‘visibility’ attribute ignored [-Wattributes]
   15 |   LLVM_ABI const RTLIB::RuntimeLibcallsInfo &RTLCI;
      |                                              ^~~~~
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/include/llvm/CodeGen/LibcallLoweringInfo.h:18:25: warning: ‘visibility’ attribute ignored [-Wattributes]
   18 |       RTLIB::Unsupported};
      |                         ^
14.274 [1156/61/2874] Building CXX object lib/Target/VE/CMakeFiles/LLVMVECodeGen.dir/VEFrameLowering.cpp.o
In file included from /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/include/llvm/CodeGen/TargetLowering.h:32,
                 from /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/VE/VEISelLowering.h:18,
                 from /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/VE/VESubtarget.h:17,
                 from /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/VE/VEFrameLowering.cpp:115:
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/include/llvm/CodeGen/LibcallLoweringInfo.h:15:46: warning: ‘visibility’ attribute ignored [-Wattributes]
   15 |   LLVM_ABI const RTLIB::RuntimeLibcallsInfo &RTLCI;
      |                                              ^~~~~
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/include/llvm/CodeGen/LibcallLoweringInfo.h:18:25: warning: ‘visibility’ attribute ignored [-Wattributes]
   18 |       RTLIB::Unsupported};
      |                         ^

```

</details>

https://github.com/llvm/llvm-project/pull/165841