[PATCH] [x32] Use ebp/esp as frame and stack pointer

[Pavel Chupin]

Hi nadav, dschuff,

Since pointers are 32-bit on x32 we can use ebp and esp as frame and stack
pointer. Some operations like PUSH/POP and CFI_INSTRUCTION still
require 64-bit register, so using 64-bit MachineFramePtr where required.

http://reviews.llvm.org/D4617

Files:
  lib/Target/X86/X86FrameLowering.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86RegisterInfo.cpp
  test/CodeGen/X86/alloca-align-rounding.ll
  test/CodeGen/X86/frameaddr.ll
  test/CodeGen/X86/x86-64-stack-and-frame-ptr.ll
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