[PATCH] D48372: [MemorySSAUpdater] Remove deleted trivial Phis from active workset

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

> We do linear lookups for NonOptPhis.erase() anyway

SmallSet insertion and removal are log(N) for large N.

https://reviews.llvm.org/D48504 is a (almost) drop-in replacement for SetVector, with a constant time remove().


https://reviews.llvm.org/D48372