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

[Michael Kuperstein]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7196

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

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