[clang] [Clang][Sema] Fix malformed AST for anonymous class access in template. (PR #90842)

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martinboehme wrote:

> Thank you for this fix.
> 
> You should reference the issue that this fixes in your summary.

There isn't currently a github issue for this. Should I create one?

> This also need a release note.

Added. How does this look? (Is it in the appropriate section?)

https://github.com/llvm/llvm-project/pull/90842