Dan Gohman f638f4ff84 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.

llvm-svn: 107316

2010-06-30 20:21:12 +00:00

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