[clang] [Clang] Avoid assertion failure for initialized extern aliases (PR #223124)

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keepyixiao wrote:

> @keepyixiao btw, please do not rebase once you've pushed a PR up for review (https://llvm.org/docs/GitHub.html#rebasing-pull-requests-and-force-pushes), that makes it much harder for reviewers to check out old comments and the history of the PR as it's changed over time. Better to use a merge to catch the PR up to the main branch.

Thanks for pointing this out! I wasn't aware of this guideline. I'll avoid rebasing/force-pushing PR branches during review in the future.

https://github.com/llvm/llvm-project/pull/223124