[lld] [llvm] [clang] [FuncAttrs] Deduce `noundef` attributes for return values (PR #76553)

[Yingwei Zheng via cfe-commits]

dtcxzyw wrote:

> > Yeah, we should skip this inference for functions with the sanitize_memory attribute.
> 
> I will post a patch later.

Candidate patch: https://github.com/llvm/llvm-project/pull/76691

https://github.com/llvm/llvm-project/pull/76553