[PATCH] Add peephole optimization to use LEA instructions of Intel Atom

[Preston Gurd]

  This version of the patch addresses the reviewer's concerns about adding unnecessary complexity to the convertToThreeAddress function, by moving those changes to the new function postRAConvertToLEA, which is internal to the FixupLEAPass.

Hi nadav, sdt,

http://llvm-reviews.chandlerc.com/D660

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D660?vs=1610&id=1735#toc

Files:
  lib/Target/X86/X86.h
  lib/Target/X86/X86FixupLEAs.cpp
  lib/Target/X86/CMakeLists.txt
  lib/Target/X86/X86.td
  lib/Target/X86/X86Subtarget.cpp
  lib/Target/X86/X86TargetMachine.cpp
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86Subtarget.h
  test/CodeGen/X86/atom-fixup-lea2.ll
  test/CodeGen/X86/lsr-static-addr.ll
  test/CodeGen/X86/atom-fixup-lea1.ll
  test/CodeGen/X86/atom-fixup-lea3.ll
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