[LV] Don't skip VPlan cost model for div/rem instructions (#187056) In LoopVectorizationPlanner::precomputeCosts we are skipping calculation of costs using the VPlan cost model, instead preferring to use the legacy costs. This helps to prevent the legacy and vplan cost model assert firing, but really we should be encouraging full use of the VPlan cost model. I've created this initial PR to stop skipping the computation costs for udiv/urem/sdiv/srem instructions. The VPlan costs seem to match up nicely. I intend to follow up with more PRs to move more opcodes across.
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