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Author SHA1 Message Date
Jakob Stoklund Olesen
dcfe5f30b5 Keep track of phi join registers explicitly in LiveVariables. 
Previously, LiveIntervalAnalysis would infer phi joins by looking for multiply
defined registers. That doesn't work if the phi join is implicitly defined in
all but one of the predecessors.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96994 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-23 22:43:58 +00:00