Jakob Stoklund Olesen 811b9c475d Ignore the cloning of unknown registers. ...

THe LRE_DidCloneVirtReg callback may be called with vitual registers
that RAGreedy doesn't even know about yet.  In that case, there are no
data structures to update.

llvm-svn: 139702

2011-09-14 17:34:37 +00:00

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