[PATCH] D57567: [SCEV] Do not bother creating separate SCEVUnknown for unreachable nodes

[Sanjoy Das via Phabricator via llvm-commits]

sanjoy accepted this revision.
sanjoy added a comment.
This revision is now accepted and ready to land.

This is fine, but IMO mapping them to `undef` feels cleaner conceptually.


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  https://reviews.llvm.org/D57567/new/

https://reviews.llvm.org/D57567