[CodeGen] Add tests for ShadowStackGCLowering IR pass (#183167) 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>
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