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Commit e92e5ee8 authored by Jakob Stoklund Olesen's avatar Jakob Stoklund Olesen
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Constrain register classes instead of emitting copies. 

Sometimes register class constraints are trivial, like GR32->GR32_NOSP,
or GPR->rGPR.  Teach InstrEmitter to simply constrain the virtual
register instead of emitting a copy in these cases.

Normally, these copies are handled by the coalescer.  This saves some
coalescer work.

llvm-svn: 140340
parent 0f36544c
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