[PATCH] D158564: [RISCV] Fix assertion failure when zcmp extension is enabled.

[Anmol P. Paralkar 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".

      

Merged in test case from D158379 <https://reviews.llvm.org/D158379>.


https://reviews.llvm.org/D158564

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

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