Jakob Stoklund Olesen 502e4c6ac4 Teach LiveVariables to handle <undef> operands. ...

It's simple: Don't treat <undef> operands as uses, and don't assume a
virtual register has a defining instruction unless a real use has been
seen.

llvm-svn: 159061

2012-06-23 02:23:00 +00:00

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