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

[Jingyue Wu]

Hi broune, eliben, hfinkel, meheff, sanjoy,

With this patch, SLSR may rewrite

S1: X = B + i * S
S2: Y = B + i' * S

to

S2: Y = X + (i' - i) * S

http://reviews.llvm.org/D8983

Files:
  lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
  test/Transforms/StraightLineStrengthReduce/slsr-add.ll
  test/Transforms/StraightLineStrengthReduce/slsr-mul.ll

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