llvm-project

3eeaa773 - AMDGPU: Fix machine sink crash on an undef SGPR operand (#216721)

AMDGPU: Fix machine sink crash on an undef SGPR operand (#216721) isSafeToSink dereferenced the defining instruction of an SGPR use without checking for a null def, which crashes on an undef operand that has no defining instruction. Found by AI while working on something else. Co-authored-by: Claude (Opus 4.8) <noreply@anthropic.com>