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Author SHA1 Message Date
Dan Gohman fb02cec44e Fix BasicAA's recursion detection so that it doesn't pessimize 
queries in the case of a DAG, where a query reaches a node
visited earlier, but it's not on a cycle. This avoids
MayAlias results in cases where BasicAA is expected to
return MustAlias or PartialAlias in order to protect TBAA.

llvm-svn: 132609
 2011-06-04 00:31:50 +00:00