[clang] [clang] Add support for uninitialized array access warnings #165239 (PR #166932)

[Yanzuo Liu via cfe-commits]

zwuis wrote:

Thank you for your patch!

If AI was used to create PR, please disclose it. And to what extent it was used.

Please do not use AI to generate PR description. Please see https://llvm.org/docs/DeveloperPolicy.html#commit-messages for how to write it.

Please add tests to "clang/test".

Please add a release note entry to "clang/docs/ReleaseNotes.rst".

Please remove unrelated changes.

https://github.com/llvm/llvm-project/pull/166932