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

[Yingwei Zheng via cfe-commits]

dtcxzyw wrote:

> Failed Tests (3):
  LLVM :: CodeGen/BPF/loop-exit-cond.ll
  LLVM :: CodeGen/NVPTX/nvvm-reflect-opaque.ll
  LLVM :: CodeGen/NVPTX/nvvm-reflect.ll

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