[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 `llvm-clang-aarch64-darwin` running on `doug-worker-4` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/20125

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

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: Transforms/LowerTypeTests/cfi-coff-comdat-rename.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
/Users/buildbot/buildbot-root/aarch64-darwin/build/bin/opt -S -passes=lowertypetests /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Transforms/LowerTypeTests/cfi-coff-comdat-rename.ll | /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Transforms/LowerTypeTests/cfi-coff-comdat-rename.ll # RUN: at line 1
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/opt -S -passes=lowertypetests /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Transforms/LowerTypeTests/cfi-coff-comdat-rename.ll
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Transforms/LowerTypeTests/cfi-coff-comdat-rename.ll
/Users/buildbot/buildbot-root/aarch64-darwin/build/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.
/Users/buildbot/buildbot-root/aarch64-darwin/build/bin/opt -S -passes=lowertypetests /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Transforms/LowerTypeTests/cfi-coff-comdat-rename.ll | /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llc -asm-verbose=false # RUN: at line 8
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/opt -S -passes=lowertypetests /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Transforms/LowerTypeTests/cfi-coff-comdat-rename.ll
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llc -asm-verbose=false
/Users/buildbot/buildbot-root/aarch64-darwin/build/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.
/Users/buildbot/buildbot-root/aarch64-darwin/build/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