[PATCH] Make foldMemoryOperandImpl() insert instructions instead of caller.

[Vasileios Kalintiris]

Hi dsanders,

This patch changes the semantics of the foldMemoryOperandImpl() method in
order to insert the newly constructed instruction into the machine basic
block. We use this change in order to store zero to memory using the $zero
register on Mips.

http://reviews.llvm.org/D9161

Files:
  lib/CodeGen/TargetInstrInfo.cpp
  lib/Target/Mips/Mips16InstrInfo.cpp
  lib/Target/Mips/Mips16InstrInfo.h
  lib/Target/Mips/MipsInstrInfo.h
  lib/Target/Mips/MipsSEInstrInfo.cpp
  lib/Target/Mips/MipsSEInstrInfo.h
  lib/Target/SystemZ/SystemZInstrInfo.cpp
  lib/Target/X86/X86FastISel.cpp
  lib/Target/X86/X86InstrInfo.cpp
  test/CodeGen/Mips/fold-zero-copy.ll

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