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Author SHA1 Message Date
Jakob Stoklund Olesen
76ff741836 Only erase virtregs with no uses left. 
Also make sure registers aren't erased twice if the dead def mentions
the register twice.

This fixes PR12911.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157254 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-05-22 14:52:12 +00:00