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An insert subvector that is inserting the result of a vector predicate sized load into undef at index 0, whose result is casted to a predicate type, can be combined into a direct predicate load. Likewise the same applies to extract subvector but in reverse. The purpose of this optimization is to clean up cases that will be introduced in a later patch where casts to/from predicate types from i8 types will use insert subvector, rather than going through memory early. This optimization is done in SVEIntrinsicOpts rather than InstCombine to re-introduce scalable loads as late as possible, to give other optimizations the best chance possible to do a good job. Differential Revision: https://reviews.llvm.org/D106549
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