[clang-tools-extra] [clang-tidy] Add an option to exclude files not present in the compile database (PR #120348)

[Congcong Cai via cfe-commits]

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@@ -115,6 +115,9 @@ Improvements to clang-tidy
 - Improved :program:`run-clang-tidy.py` script. Fixed minor shutdown noise
   happening on certain platforms when interrupting the script.
 
+- Improved :program:`clang-tidy-diff.py` script. Add an option to exclude files
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HerrCai0907 wrote:

explicit mention the option name to make it easy to touch other user.

https://github.com/llvm/llvm-project/pull/120348