[PATCH] D158256: [RISCV] Fix assertion failure when zcmp extension is enabled.

[garvit gupta via Phabricator via llvm-commits]

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Before accessing "getOpcode" thorugh machine instruction, check if the iterator
has reached the end of Machine basic block otherwise we will crash at the
assertion `!NodePtr->isKnownSentinel()`.

The above assertion is hit in "Prologue/Epilogue Insertion & Frame Finalization
pass".


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158256

Files:
  llvm/lib/Target/RISCV/RISCVFrameLowering.cpp
  llvm/test/CodeGen/RISCV/prolog-epilog-crash.mir

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