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Commit 3d6ac44d authored by Dan Gohman's avatar Dan Gohman
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Factor out some of the code for updating old SCEVUnknown values, and

extend it to handle the case where multiple RAUWs affect a single
SCEVUnknown.

Add a ScalarEvolution unittest to test for this situation.

llvm-svn: 109705
parent 43397fc4
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