[PATCH] [LSR] Canonicalize reg1 + ... + regN into reg1 + ... + 1*regN

[Quentin Colombet]

Refine the comments on isAMCompletelyFolded.
Fix a think-o in the base adds computation.

http://reviews.llvm.org/D3830

Files:
  lib/Transforms/Scalar/LoopStrengthReduce.cpp
  test/CodeGen/X86/avoid_complex_am.ll
  test/CodeGen/X86/masked-iv-safe.ll
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