[LV] Move runtime pointer size check to LVP::plan().
This removes the need for the remaining doesNotMeet check and instead directly checks if there are too many runtime checks for vectorization in the planner. A subsequent patch will adjust the logic used to decide whether to vectorize with runtime to consider their cost more accurately. Reviewed By: lebedev.ri Differential Revision: https://reviews.llvm.org/D98634
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