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

[Jingyue Wu]

Take 2 towards handling GEPs in SLSR

- replace BaseExpr with SCEV
- discover more patterns of GEP that can be SLSR'ed


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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