Dan Gohman 48f8222293 Re-apply 70645, converting ScalarEvolution to use ... CallbackVH, with fixes. allUsesReplacedWith need to walk the def-use chains and invalidate all users of a value that is replaced. SCEVs of users need to be recalcualted even if the new value is equivalent. Also, make forgetLoopPHIs walk def-use chains, since any SCEV that depends on a PHI should be recalculated when more information about that PHI becomes available. llvm-svn: 70927		2009-05-04 22:30:44 +00:00
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llvm	Re-apply 70645, converting ScalarEvolution to use	2009-05-04 22:30:44 +00:00
llvm-c	Oops! Missed a file in my last commit.	2009-04-30 15:29:26 +00:00