[PATCH] D27963: [Codegen] Have the generic debug skip functions return true on empty.

[Kyle Butt via Phabricator via llvm-commits]

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Overall this leads to simpler code even though a few cases are slightly longer.
NFC.


Repository:
  rL LLVM

https://reviews.llvm.org/D27963

Files:
  include/llvm/CodeGen/MachineBasicBlock.h
  lib/CodeGen/BranchFolding.cpp
  lib/CodeGen/IfConversion.cpp
  lib/CodeGen/MachineBasicBlock.cpp
  lib/CodeGen/MachineCSE.cpp
  lib/CodeGen/RegisterPressure.cpp

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