[llvm] [lld] [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.

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