[PATCH] D124050: llvm-reduce: Fix not removing first instruction in MachineBasicBlock

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: markus, reames, aeubanks, qcolombet, MatzeB.
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arsenm requested review of this revision.
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Herald added a project: LLVM.

This had the surprising behavior of using whatever instruction
happened to be first in the block as an anchor point to stick random
implicit defs on. Use a real implicit_def instead.


https://reviews.llvm.org/D124050

Files:
  llvm/test/tools/llvm-reduce/mir/generic-vreg.mir
  llvm/test/tools/llvm-reduce/mir/instr-reduce.mir
  llvm/test/tools/llvm-reduce/mir/preserve-frame-info.mir
  llvm/test/tools/llvm-reduce/mir/subreg-def0.mir
  llvm/test/tools/llvm-reduce/mir/subreg-def1.mir
  llvm/tools/llvm-reduce/deltas/ReduceInstructionsMIR.cpp

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