[clang] [AST] Ensure getRawCommentsForAnyRedecl() does not miss any redecl with a comment (PR #108475)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-cmake-x86_64-avx512-win` running on `avx512-intel64-win` while building `clang` at step 6 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/81/builds/1993

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

```
Step 6 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: tools/llvm-tli-checker/ps4-tli-check.yaml' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 4
d:\buildbot\llvm-worker\clang-cmake-x86_64-avx512-win\stage1\bin\yaml2obj.exe D:\buildbot\llvm-worker\clang-cmake-x86_64-avx512-win\llvm\llvm\test\tools\llvm-tli-checker\ps4-tli-check.yaml -DTYPE=ET_REL -DLABEL=Symbols -DZDAPV=_ZdaPv -o=D:\buildbot\llvm-worker\clang-cmake-x86_64-avx512-win\stage1\test\tools\llvm-tli-checker\Output\ps4-tli-check.yaml.tmp1
# executed command: 'd:\buildbot\llvm-worker\clang-cmake-x86_64-avx512-win\stage1\bin\yaml2obj.exe' 'D:\buildbot\llvm-worker\clang-cmake-x86_64-avx512-win\llvm\llvm\test\tools\llvm-tli-checker\ps4-tli-check.yaml' -DTYPE=ET_REL -DLABEL=Symbols -DZDAPV=_ZdaPv '-o=D:\buildbot\llvm-worker\clang-cmake-x86_64-avx512-win\stage1\test\tools\llvm-tli-checker\Output\ps4-tli-check.yaml.tmp1'
# RUN: at line 5
llvm-tli-checker --triple=x86_64-scei-ps4 D:\buildbot\llvm-worker\clang-cmake-x86_64-avx512-win\stage1\test\tools\llvm-tli-checker\Output\ps4-tli-check.yaml.tmp1 | d:\buildbot\llvm-worker\clang-cmake-x86_64-avx512-win\stage1\bin\filecheck.exe D:\buildbot\llvm-worker\clang-cmake-x86_64-avx512-win\llvm\llvm\test\tools\llvm-tli-checker\ps4-tli-check.yaml
# executed command: llvm-tli-checker --triple=x86_64-scei-ps4 'D:\buildbot\llvm-worker\clang-cmake-x86_64-avx512-win\stage1\test\tools\llvm-tli-checker\Output\ps4-tli-check.yaml.tmp1'
# executed command: 'd:\buildbot\llvm-worker\clang-cmake-x86_64-avx512-win\stage1\bin\filecheck.exe' 'D:\buildbot\llvm-worker\clang-cmake-x86_64-avx512-win\llvm\llvm\test\tools\llvm-tli-checker\ps4-tli-check.yaml'
# .---command stderr------------
# | D:\buildbot\llvm-worker\clang-cmake-x86_64-avx512-win\llvm\llvm\test\tools\llvm-tli-checker\ps4-tli-check.yaml:37:10: error: CHECK: expected string not found in input
# | # CHECK: == Total TLI yes SDK yes: 253
# |          ^
# | <stdin>:25:27: note: scanning from here
# | >> Total TLI no SDK yes: 0
# |                           ^
# | <stdin>:26:1: note: possible intended match here
# | == Total TLI yes SDK yes: 256
# | ^
# | 
# | Input file: <stdin>
# | Check file: D:\buildbot\llvm-worker\clang-cmake-x86_64-avx512-win\llvm\llvm\test\tools\llvm-tli-checker\ps4-tli-check.yaml
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             .
# |             .
# |             .
# |            20: << TLI yes SDK no : 'fmaximum_numl' 
# |            21: << TLI yes SDK no : 'fminimum_num' 
# |            22: << TLI yes SDK no : 'fminimum_numf' 
# |            23: << TLI yes SDK no : 'fminimum_numl' 
# |            24: << Total TLI yes SDK no: 18 
# |            25: >> Total TLI no SDK yes: 0 
# | check:37'0                               X error: no match found
# |            26: == Total TLI yes SDK yes: 256 
# | check:37'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | check:37'1     ?                              possible intended match
# |            27: FAIL: LLVM TLI doesn't match SDK libraries. 
# | check:37'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1

--
...

```

</details>

https://github.com/llvm/llvm-project/pull/108475