[PATCH] [X86] Convert esp-relative movs of function arguments to pushes, step 2

[Michael Kuperstein]

- Applied review comments
- Fixed another bug in the way PEI was handling push sequences (argh) - this required adding a target query.
- Made the tests check a bit more (which would have exposed the bug above earlier).


http://reviews.llvm.org/D6789

Files:
  include/llvm/Target/TargetFrameLowering.h
  lib/CodeGen/PrologEpilogInserter.cpp
  lib/CodeGen/TargetFrameLoweringImpl.cpp
  lib/Target/X86/CMakeLists.txt
  lib/Target/X86/X86.h
  lib/Target/X86/X86ConvertMovsToPushes.cpp
  lib/Target/X86/X86FastISel.cpp
  lib/Target/X86/X86FrameLowering.cpp
  lib/Target/X86/X86FrameLowering.h
  lib/Target/X86/X86InstrCompiler.td
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrInfo.h
  lib/Target/X86/X86MachineFunctionInfo.h
  lib/Target/X86/X86RegisterInfo.cpp
  lib/Target/X86/X86TargetMachine.cpp
  test/CodeGen/X86/inalloca-invoke.ll
  test/CodeGen/X86/movtopush.ll

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