[PATCH] MachineLICM: Use TargetSchedModel instead of just itineraries

[Matthias Braun]

Hi atrick,

This code previously solely relied on the deprecated instruction itineraries. This patch changes it
to also request the MSchedModel if no itineraries are available.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10428

Files:
  include/llvm/Target/TargetInstrInfo.h
  lib/CodeGen/MachineLICM.cpp
  lib/CodeGen/TargetInstrInfo.cpp
  lib/Target/ARM/ARMBaseInstrInfo.cpp
  lib/Target/ARM/ARMBaseInstrInfo.h
  lib/Target/PowerPC/PPCInstrInfo.h
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrInfo.h

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