[PATCH] [PeepholeOptimizer] Refactor the advance copy optimization to take advantage of the isRegSequence property

[Quentin Colombet]

Update according to Hal's feedbacks:
- Add more comments.
- Fix typos.

http://reviews.llvm.org/D4874

Files:
  lib/CodeGen/Passes.cpp
  lib/CodeGen/PeepholeOptimizer.cpp
  test/CodeGen/ARM/adv-copy-opt.ll
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