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

[Yingwei Zheng via cfe-commits]

dtcxzyw wrote:

> Can you please fix or revert https://lab.llvm.org/buildbot/#/builders/74/builds/24592 ?

Should be fixed by https://github.com/llvm/llvm-project/commit/7e405eb722e40c79b7726201d0f76b5dab34ba0f.
https://lab.llvm.org/buildbot/#/builders/74/builds/24613

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