[GlobalISel] Add support for scalarizing vector insert and extract elements (#153274) This Adds scalarization handling for fewer vector elements of insert and extract, so that i128 and fp128 types can be handled if they make it past combines. Inserts are unmerged with the inserted element added to the remerged vector, extracts are unmerged then the correct element is copied into the destination. With a non-constant vector the usual stack lowering is used.
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