[PATCH] [LSR] canonicalize Prod*(1<<C) to Prod<<C

[Jingyue Wu]

Hi sanjoy, atrick,

Because LSR happens at a late stage where mul of a power of 2 is
typically canonicalized to shl, this canonicalization emits code that
can be better CSE'ed.

http://reviews.llvm.org/D10448

Files:
  lib/Analysis/ScalarEvolutionExpander.cpp
  test/Transforms/LoopIdiom/basic.ll
  test/Transforms/LoopReroll/nonconst_lb.ll
  test/Transforms/LoopStrengthReduce/2011-10-06-ReusePhi.ll
  test/Transforms/LoopStrengthReduce/post-inc-icmpzero.ll
  test/Transforms/LoopStrengthReduce/shl.ll

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