[PATCH] [X86] Improve mul w/ overflow codegen, to MUL8+SETO.

[Ahmed Bougacha]

Closed by commit rL220516 (authored by @ab).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D5809

Files:
  llvm/trunk/lib/Target/X86/X86ISelDAGToDAG.cpp
  llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
  llvm/trunk/lib/Target/X86/X86ISelLowering.h
  llvm/trunk/test/CodeGen/X86/i8-umulo.ll
  llvm/trunk/test/CodeGen/X86/xaluo.ll
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