[clang] [llvm] [Clang] Show inlining hints for __attribute__((warning/error)) (PR #174892)

[Nick Desaulniers via cfe-commits]

nickdesaulniers wrote:

I think @dwblaikie also expressed similar sentiments (or perhaps I'm mixing up a conversation I had with David with Aaron, IDK). Anyways, all feedback welcome here.

https://github.com/llvm/llvm-project/pull/174892