[clang-tools-extra] [clang-tidy] Header check support for check_clang_tidy.py (PR #175735)

[via cfe-commits]

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zeyi2 wrote:

I think it is okay? We already have similar entries in ReleaseNotes of previous release: https://releases.llvm.org/21.1.0/tools/clang/tools/extra/docs/ReleaseNotes.html#improvements-to-clang-tidy

https://github.com/llvm/llvm-project/pull/175735