[llvm] [llvm][CFI] Do not canonicalize COFF functions in a comdat (PR #139962)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-armv8-quick` running on `linaro-clang-armv8-quick` while building `llvm` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/154/builds/16186

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

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: Transforms/LowerTypeTests/cfi-coff-comdat-rename.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
/home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/opt -S -passes=lowertypetests /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/Transforms/LowerTypeTests/cfi-coff-comdat-rename.ll | /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/FileCheck /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/Transforms/LowerTypeTests/cfi-coff-comdat-rename.ll # RUN: at line 1
+ /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/opt -S -passes=lowertypetests /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/Transforms/LowerTypeTests/cfi-coff-comdat-rename.ll
+ /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/FileCheck /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/Transforms/LowerTypeTests/cfi-coff-comdat-rename.ll
/home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/opt: WARNING: failed to create target machine for 'x86_64-pc-windows-msvc': unable to get target for 'x86_64-pc-windows-msvc', see --version and --triple.
/home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/opt -S -passes=lowertypetests /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/Transforms/LowerTypeTests/cfi-coff-comdat-rename.ll | /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/llc -asm-verbose=false # RUN: at line 8
+ /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/opt -S -passes=lowertypetests /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/Transforms/LowerTypeTests/cfi-coff-comdat-rename.ll
+ /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/llc -asm-verbose=false
/home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/opt: WARNING: failed to create target machine for 'x86_64-pc-windows-msvc': unable to get target for 'x86_64-pc-windows-msvc', see --version and --triple.
/home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/llc: error: unable to get target for 'x86_64-pc-windows-msvc', see --version and --triple.

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/139962