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Author SHA1 Message Date
Jakob Stoklund Olesen
cf29251712 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.

llvm-svn: 96994
 2010-02-23 22:43:58 +00:00