[clang-tools-extra] [clang-tidy] Fix bugprone-bad-signal-to-kill-thread not working in clangd (PR #180711)

[via cfe-commits]

github-actions[bot] wrote:

<!--LLVM CODE LINT COMMENT: clang-tidy-->


:warning: C/C++ code linter, clang-tidy found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
</summary>

```bash

git diff -U0 origin/main...HEAD -- clang-tools-extra/clang-tidy/bugprone/BadSignalToKillThreadCheck.cpp |
python3 clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py   -path build -p1 -quiet
```

</details>

<details>
<summary>
View the output from clang-tidy here.
</summary>

```
clang-tools-extra/clang-tidy/bugprone/BadSignalToKillThreadCheck.cpp:50:7: warning: variable 'Loc' of type 'SourceLocation' can be declared 'const' [misc-const-correctness]
   50 |       SourceLocation Loc = T.getLocation();
      |       ^
      |                      const 
clang-tools-extra/clang-tidy/bugprone/BadSignalToKillThreadCheck.cpp:57:7: warning: variable 'Offset' of type 'unsigned int' can be declared 'const' [misc-const-correctness]
   57 |       unsigned Offset = SM->getFileOffset(Loc);
      |       ^
      |                const
```

</details>


https://github.com/llvm/llvm-project/pull/180711