[PATCH] [SLSR] handle candidate form (B + i * S)

[Jingyue Wu]

Do not SLSR if (B + i * S) can be folded to an addressing mode.


http://reviews.llvm.org/D8983

Files:
  lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
  test/Transforms/StraightLineStrengthReduce/X86/no-slsr.ll
  test/Transforms/StraightLineStrengthReduce/slsr-add.ll
  test/Transforms/StraightLineStrengthReduce/slsr-mul.ll

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