[PATCH] [X86] Reduce some 32-bit imuls into lea + shift

[Michael Kuperstein]

Hi delena, nadav,

The existing code only performs the transformation for imulq on 64-bit platforms. It makes as much sense to make it for imull, on both 32-bit and 64-bit.
It looks like there's some additional clean-up needed, as well as additional patterns, but that'll go into a separate review.

Also extended the test to cover more cases.

http://reviews.llvm.org/D7196

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/imul.ll
  test/CodeGen/X86/imul64-lea.ll
  test/Transforms/LoopStrengthReduce/X86/ivchain-X86.ll

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