clean up onUse, onDef, onDefResolveForward #21835
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onUseandonDefResolveForwardhave been no-ops since #20250, however they were not removed from code as they could serve as some kind of comment. In this PR these are removed entirely sinceonDefResolveForwardis used once andonUseis basically always paired with amarkUsed/incl(s.flags, sfUsed)call. In the case where this is removing too much information though, instead of removing we can replace these with just comments, like# s is used here.The stub definition of
onDefis also moved next to the real definition ofonDefinstead of along withonUseandonDefResolveForward.