[PATCH] D148329: [BreakFalseDeps] Respect dead blocks.

[Serguei Katkov via Phabricator via llvm-commits]

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The pass uses ReachingDefAnalysis which has no information about
instructions in dead blocks.

So do not process them.


https://reviews.llvm.org/D148329

Files:
  llvm/lib/CodeGen/BreakFalseDeps.cpp
  llvm/lib/CodeGen/CodeGen.cpp
  llvm/test/CodeGen/X86/break-false-dep-crash.mir

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