nir: Set the alignment for SSBO lowering
The alignment can just be copied from the source intrinsic.
Fixes the validation assertion nir_intrinsic_align_offset(instr) < nir_intrinsic_align_mul(instr).
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
The alignment can just be copied from the source intrinsic.
Fixes the validation assertion nir_intrinsic_align_offset(instr) < nir_intrinsic_align_mul(instr).