[PATCH] [LSR] Generate and use zero extends

[Sanjoy Das]

Hi atrick,

If a scale or a base register can be rewritten as "Zext({A,+,1})" then
LSR will now consider a formula of that form in its normal cost
computation.

Depends on D9180

http://reviews.llvm.org/D9181

Files:
  lib/Transforms/Scalar/LoopStrengthReduce.cpp
  test/Transforms/LoopStrengthReduce/zext-of-scale.ll

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