[PATCH] [x86 - inline asm] Favor reg over memory in asm w/ one input parameter

[Gerolf Hoflehner]

Only give register preference to the parameter when it resides in a register as Eric suggested.


http://reviews.llvm.org/D9271

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  test/CodeGen/X86/inline-asm-rm-constraint.ll

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