[clang] [CLANG] Resolves crash on invalid loop vectorize_width (PR #169473)

[Yanzuo Liu via cfe-commits]

zwuis wrote:

Thank you for your patch! Please add a release note entry to "clang/docs/ReleaseNotes.rst" so that users can know the improvement. Please read <https://clang.llvm.org/docs/InternalsManual.html#testing>.

https://github.com/llvm/llvm-project/pull/169473