[TTI] Use element alignment in vp.strided.{load,store} cost (#101940)
In SelectionDAGBuilder, a vp.strided.{load,store} uses the datalayout
alignment of the element type if an align attribute isn't specified on
the pointer operand. This updates BasicTTIImpl to use said element
alignment instead of defaulting to one when costing it.
This mainly just fixes the output of the cost model tests on RISC-V,
since as far as I'm aware nothing uses the cost of these, e.g. SLP calls
getStridedMemoryOpCost directly
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