[llvm-branch-commits] [clang] release/21.x: [clang][modules] Fix crash in enum visibility lookup for C++20 header units (#166272) (PR #166701)

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dyung wrote:

> > @ChuanqiXu9 What do you think about merging this PR to the release branch?
> 
> This is a simple fix. I think there is no risks.

Could you approve the port request as a formality if it is okay with you?

https://github.com/llvm/llvm-project/pull/166701