[PATCH] Peephole optimization causes different code generation at "-O2 -g" and "-O2".

[Katya Romanova]

  Here is an updated patch.
  - it has been built and tested against trunk at 203192 (Mar6)
  - the 2 test cases were merged to 1, and debug info reduced a bit more.
  - the test case was checked with -mcpu=atom

Hi echristo,

http://llvm-reviews.chandlerc.com/D2728

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2728?vs=7414&id=7623#toc

Files:
  llvm/test/CodeGen/X86/dbg-changes-codegen.ll
  llvm/include/llvm/CodeGen/MachineRegisterInfo.h
  llvm/lib/CodeGen/MachineRegisterInfo.cpp
  llvm/lib/CodeGen/DeadMachineInstructionElim.cpp
  llvm/lib/CodeGen/PeepholeOptimizer.cpp
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