[PATCH] D158503: [CGP] Remove dead PHI nodes before elimination of mostly empty blocks

[Eli Friedman via Phabricator via llvm-commits]

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

Please run some quick benchmarking to make sure this doesn't significantly slow down compile-time. (I don't think it should, but RecursivelyDeleteDeadPHINode is a recursive algorithm, so it isn't entirely obvious.)

Otherwise LGTM


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https://reviews.llvm.org/D158503