In ConvertVectorToLLVM, the only option for setting alignment of
`vector.gather`, `vector.scatter`, and the `vector.load/store` ops was
to extract it from the datatype of the memref type. However, this is
insufficient for hardware backends requiring alignment of vector types.
This PR introduces the `use-vector-alignment` option to the
`ConvertVectorToLLVMPass`, which makes the pass use the alignment of the
vector type of these operations instead of the alignment of the memref
type.
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Co-authored-by: Lily Orth-Smith <lorthsmith@microsoft.com>
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