[LoopVectorize] Use predicated version of getSmallConstantMaxTripCount (#109928) There are a number of places where we call getSmallConstantMaxTripCount without passing a vector of predicates: getSmallBestKnownTC isIndvarOverflowCheckKnownFalse computeMaxVF isMoreProfitable I've changed all of these to now pass in a predicate vector so that we get the benefit of making better vectorisation choices when we know the max trip count for loops that require SCEV predicate checks. I've tried to add tests that cover all the cases affected by these changes.
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