Add llvm/test/CodeGen/Generic/shadow-stack-gc-lowering.ll testing the
opt-level behavior of the shadow-stack-gc-lowering module pass,
covering:
- Single root: frame push/pop at entry and return
- Two roots: multi-slot frame, NumRoots=2/NumMeta=0 in the frame map
- Root with non-null metadata: NumMeta=1, metadata array in gc_map
- Mixed metadata: CollectRoots ordering (metadata roots sorted first)
- No roots: pass must leave the function unchanged
- Invoke: EscapeEnumerator inserts pop on both normal and unwind exits
As requested in https://github.com/llvm/llvm-project/pull/178436, since
the only existing tests seem to be that llc doesn't crash (in
llvm/test/CodeGen/X86/GC)
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
2981f5f045