[clang] [Clang][Sema]:Fix musttail attribute on a function with not_tail_called attribute has no warning/error (PR #134465)

[Erich Keane via cfe-commits]

https://github.com/erichkeane approved this pull request.

Since Aaron is happy with the new note, looks like we're good.  One of us will merge it when it passes CI.

https://github.com/llvm/llvm-project/pull/134465