In ScalarEvolution::forgetValue, eliminate any SCEVUnknown entries associated with the value being erased in the folding set map.  These entries used to be harmless, because a SCEVUnknown doesn't store any information about its Value*, so having a new Value allocated at the old Value's address wasn't a problem. But now that ScalarEvolution is storing more information about values, this is no longer safe.
In ScalarEvolution::forgetValue, eliminate any SCEVUnknown
entries associated with the value being erased in the
folding set map.  These entries used to be harmless, because
a SCEVUnknown doesn't store any information about its Value*,
so having a new Value allocated at the old Value's address
wasn't a problem. But now that ScalarEvolution is storing more
information about values, this is no longer safe.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@107316 91177308-0d34-0410-b5e6-96231b3b80d8

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