[clang-tools-extra] [clang-tidy] Improve redundant-casting check for binary operation (PR #191386)

[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/RedundantCastingCheck.cpp clang-tools-extra/clang-tidy/readability/RedundantCastingCheck.h |
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/RedundantCastingCheck.cpp:53:13: warning: invalid case style for function 'BinaryOperatorOperandsTypesEqualToOperatorResultType' [readability-identifier-naming]
   53 | static bool BinaryOperatorOperandsTypesEqualToOperatorResultType(
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |             binaryOperatorOperandsTypesEqualToOperatorResultType
```

</details>


https://github.com/llvm/llvm-project/pull/191386