[clang] [clang] Ignore GCC 11 `[[malloc(x)]]` attribute (PR #68059)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

Thank you for the fix!

We generally want ignored attributes to be diagnosed as being ignored; otherwise users have a much harder time determining whether the attribute is working or not. I think we should issue an "attribute ignored" warning when we're dropping the attribute in the AST.

Also, the changes should come with a release note so that users know about the bug fix.

https://github.com/llvm/llvm-project/pull/68059