rustc_trans: don't round up the DST prefix size to its alignment. #36027
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rustc_trans: don't round up the DST prefix size to its alignment. Fixes #35815 by using `ty::layout` and `min_size` to compute the size of the DST prefix. `ty::layout::Struct::min_size` is not rounded up to alignment, which could be smaller for the DST field.
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Fixes #35815 by using
ty::layoutandmin_sizeto compute the size of the DST prefix.ty::layout::Struct::min_sizeis not rounded up to alignment, which could be smaller for the DST field.