llvm-project

f284ae2e - [RISCV] Ignore debug instructions in epilogue block checks (#219401)

[RISCV] Ignore debug instructions in epilogue block checks (#219401) A debug instruction in a return-only block can make `RISCVFrameLowering::canUseAsEpilogue` reject an otherwise valid shrink-wrap point. This moves the save and restore libcalls onto the fast path. Ignore debug instructions in the successor cardinality check while continuing to count bundle interiors, pseudo probes, and other non-debug instructions. The first commit records the existing behavior. The second applies the fix and updates the test expectations to require localized save and restore calls. Fixes #219378 Testing: - Verified that the regression test fails on an affected compiler. - Verified the targeted test after the fix. - RISC-V CodeGen: 2654/2654 passed. Assisted-by: OpenAI Codex 5.6 Sol, co-reviewed by Claude and Yongqiang Tian.