Add DstLayout::pad_to_align
#638
Merged
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DstLayout::pad_to_alignis comparable toalloc::Layout::pad_to_align, except that it additionally handles DSTs. This is the second of two steps needed forDstLayoutto support an API in the form of:(The first step was implementing
DstLayout::extendin #633).Despite the similarities between
DstLayout::pad_to_alignandLayout::pad_to_align, the former cannot be implemented in terms of the latter becauseLayout::pad_to_alignis notconst. This introduces a risk that our computations here diverge from those inLayout::pad_to_align, but this PR also includes Kani proofs thatDstLayout::pad_to_alignbehaves comparably toLayout::pad_to_align.Makes progress towards #29.