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When last chance recoloring is used, the list of NewVRegs may not be empty when calling selectOrSplitImpl. Indeed, another coloring may have taken place with splitting/spilling in the same recoloring session. Relax an assertion to take this into account and adapt a condition to act as if the NewVRegs were local to this selectOrSplitImpl instance. Unfortunately I am unable to produce a test case for this, I was only able to reproduce the conditions on an out-of-tree target. llvm-svn: 281782
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