[clang-tools-extra] [clang-tidy] Fix De Morgan for overloaded comparisons (PR #221432)

[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/readability/SimplifyBooleanExprCheck.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/readability/SimplifyBooleanExprCheck.cpp:936:12: warning: invalid case style for variable 'fixed' [readability-identifier-naming]
  936 |   if (auto fixed = tryFixCXXOperator(E, Fixes))
      |            ^~~~~
      |            Fixed
  937 |     return *fixed;
      |             ~~~~~
      |             Fixed
clang-tools-extra/clang-tidy/readability/SimplifyBooleanExprCheck.cpp:943:14: warning: invalid case style for variable 'fixed' [readability-identifier-naming]
  943 |     if (auto fixed = tryFixCXXOperator(Paren->getSubExpr(), Fixes))
      |              ^~~~~
      |              Fixed
  944 |       return *fixed;
      |               ~~~~~
      |               Fixed
```

</details>


https://github.com/llvm/llvm-project/pull/221432