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

[Katya Romanova]

  Attached is the updated patch that addresses the issues raised:
  - refactor the code that undefs DBG_VALUE into a function
  -- the implementation is in MachineRegisterInfo
  -- I could not see any other reasonably obvious place to add it
  - remove unnecessary debug info from test cases
  - improve comments

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2728?vs=7097&id=7414#toc

Files:
  llvm/include/llvm/CodeGen/MachineRegisterInfo.h
  llvm/lib/CodeGen/PeepholeOptimizer.cpp
  llvm/lib/CodeGen/MachineRegisterInfo.cpp
  llvm/lib/CodeGen/DeadMachineInstructionElim.cpp
  llvm/test/CodeGen/X86/dbg-changes-codegen-1.ll
  llvm/test/CodeGen/X86/dbg-changes-codegen-2.ll
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