[PATCH] [SLSR] handle candidate form &B[i * S]

[Jingyue Wu]

Hi hfinkel, atrick, meheff, eliben,

This patch enhances SLSR to handle another candidate form &B[i * S]. If
we found two candidates

S1: X = &B[i * S]
S2: Y = &B[i' * S]

and S1 dominates S2, we can replace S2 with

Y = &X[(i' - i) * S]

http://reviews.llvm.org/D7459

Files:
  lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
  test/Transforms/StraightLineStrengthReduce/X86/lit.local.cfg
  test/Transforms/StraightLineStrengthReduce/X86/no-slsr.ll
  test/Transforms/StraightLineStrengthReduce/slsr-gep.ll
  test/Transforms/StraightLineStrengthReduce/slsr-mul.ll
  test/Transforms/StraightLineStrengthReduce/slsr.ll

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