[PATCH] Add a shrink-wrapping pass to improve the placement of prologue and epilogue.

[Quentin Colombet]

Update the EntryBlock, ReturnBlocks fields in PEI.


http://reviews.llvm.org/D9210

Files:
  include/llvm/CodeGen/MachineFrameInfo.h
  include/llvm/CodeGen/Passes.h
  include/llvm/InitializePasses.h
  include/llvm/Target/TargetFrameLowering.h
  lib/CodeGen/CMakeLists.txt
  lib/CodeGen/CodeGen.cpp
  lib/CodeGen/MachineFunction.cpp
  lib/CodeGen/Passes.cpp
  lib/CodeGen/PrologEpilogInserter.cpp
  lib/CodeGen/ShrinkWrap.cpp
  lib/Target/AArch64/AArch64FrameLowering.cpp
  lib/Target/AArch64/AArch64FrameLowering.h
  lib/Target/ARM/ARMFrameLowering.cpp
  lib/Target/ARM/ARMFrameLowering.h
  lib/Target/ARM/Thumb1FrameLowering.cpp
  lib/Target/ARM/Thumb1FrameLowering.h
  lib/Target/BPF/BPFFrameLowering.cpp
  lib/Target/BPF/BPFFrameLowering.h
  lib/Target/Hexagon/HexagonFrameLowering.cpp
  lib/Target/Hexagon/HexagonFrameLowering.h
  lib/Target/MSP430/MSP430FrameLowering.cpp
  lib/Target/MSP430/MSP430FrameLowering.h
  lib/Target/Mips/Mips16FrameLowering.cpp
  lib/Target/Mips/Mips16FrameLowering.h
  lib/Target/Mips/MipsSEFrameLowering.cpp
  lib/Target/Mips/MipsSEFrameLowering.h
  lib/Target/NVPTX/NVPTXFrameLowering.cpp
  lib/Target/NVPTX/NVPTXFrameLowering.h
  lib/Target/NVPTX/NVPTXPrologEpilogPass.cpp
  lib/Target/PowerPC/PPCFrameLowering.cpp
  lib/Target/PowerPC/PPCFrameLowering.h
  lib/Target/R600/AMDGPUFrameLowering.cpp
  lib/Target/R600/AMDGPUFrameLowering.h
  lib/Target/Sparc/SparcFrameLowering.cpp
  lib/Target/Sparc/SparcFrameLowering.h
  lib/Target/SystemZ/SystemZFrameLowering.cpp
  lib/Target/SystemZ/SystemZFrameLowering.h
  lib/Target/X86/X86FrameLowering.cpp
  lib/Target/X86/X86FrameLowering.h
  lib/Target/XCore/XCoreFrameLowering.cpp
  lib/Target/XCore/XCoreFrameLowering.h
  test/CodeGen/AArch64/arm64-shrink-wrapping.ll

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