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5b74e5abb8
This lifts the (very few) places the legalizer would delete dead nodes into the outer loop around the legalizer. This is significantly simpler because it doesn't require the legalizer itself to manage the iterator validity, and it doesn't require the legalizer to be a DAG update listener in order to remove things from the legalized set. It also makes the interface much less contrived for the case of the legalizer running inside the last phase of DAG combining. I'm working on centralizing the deletion of nodes during both legalizing and combining as much as possible. My hope is to remove the need for DAG update listeners from the combiner next, which would remove a costly virtual dispatch chain on every deletion. This in turn should allow us to more aggressively delete DAG nodes during combining which will in turn allow us to combine more aggressively by exposing the actual nodes which have single users to the combine phases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214546 91177308-0d34-0410-b5e6-96231b3b80d8