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Commit 0b89dff3 authored by Dan Gohman's avatar Dan Gohman
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Instead of eagerly creating new SCEVs to replace all SCEVs that are

affected after a PHI node has been analyzed, just remove affected
SCEVs from the Scalars map, so that they'll be (lazily) recreated as
needed. This avoids creating SCEV objects that aren't actually needed.

Also, rewrite the associated def-use walking code to be non-recursive
and to continue traversing past Instructions that don't have an
entry in the Scalars map.

llvm-svn: 77032
parent 3b5791f9
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