Jakob Stoklund Olesen af50f17df4 Stop adding <imp-def> operands when expanding REG_SEQUENCE. ...

These extra operands are not needed by register allocators using
VirtRegRewriter, and RAFast don't need them any longer.

By omitting the <imp-def> operands, it becomes possible for the new
register coalescer to track which lanes are valid and which are undef.

llvm-svn: 164073

2012-09-17 23:03:21 +00:00

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