Andrew Trick 2e87517144 Fix for r180193 - MI Sched: eliminate local vreg. ...

Fixes PR15838. Need to check for blocks with nothing but dbg.value.

I'm not sure how to force this situation with a unit test. I tried to
reduce the test case in PR15838 (1k lines of metadata) but gave up.

llvm-svn: 180227

2013-04-24 23:19:56 +00:00

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