[clang] [Clang] Fix isWeakImported() to traverse redeclaration chain for avai… (PR #181482)

[via cfe-commits]

kevinlzh1108 wrote:

> Did you use AI to write the PR description and/or the code? If so, you need to disclose it: https://llvm.org/docs/AIToolPolicy.html
> 
> Please add "Fixes #181298 " to the PR message so github will autoclose that issue if this PR is merged (it isn't enough to just write "Related to #181298" in a separate comment)
> 
> I've added some other people, since I'm not super qualified to review this area of the code. With that being said...



> Did you use AI to write the PR description and/or the code? If so, you need to disclose it: https://llvm.org/docs/AIToolPolicy.html
> 
> Please add "Fixes #181298 " to the PR message so github will autoclose that issue if this PR is merged (it isn't enough to just write "Related to #181298" in a separate comment)
> 
> I've added some other people, since I'm not super qualified to review this area of the code. With that being said...

Thanks for the review and for adding more reviewers!

  AI disclosure: Yes, I used Claude (Anthropic) to assist with writing the test case and PR description. This is noted in the commit trailer (Co-Authored-By: Claude Opus 4.6 (1M context) <noreply at anthropic.com>), per the LLVM AI policy. The core
   fix in DeclBase.cpp was written by me based on my analysis of the bug.

  I've updated the PR description to include Fixes #181298 so GitHub will auto-close the issue on merge.

https://github.com/llvm/llvm-project/pull/181482