[NVPTX] Fixup v2i8 parameter and return lowering (#145585) This change fixes v2i8 lowering for parameters and returned values. As part of this work, I move the lowering for return values to use generic ISD::STORE nodes as these are more flexible and have existing legalization handling. Note that calling a function with v2i8 arguments or returns is still not working but this is left for a subsequent change as this MR is already fairly large. Partially addresses #128853
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