Properly constrain register classes in 2-addr.
X86 has 2-addr instructions with different constraints on the tied def and use operands. One is GR32, one is GR32_NOSP. llvm-svn: 157149
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X86 has 2-addr instructions with different constraints on the tied def and use operands. One is GR32, one is GR32_NOSP. llvm-svn: 157149