Don't expose redundant information in rustc_public's LayoutShape
#151040
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Enum variant layouts don't need to store a full `LayoutShape`; just storing
the fields offsets is enough and all other information can be inferred from
the parent layout:
- size, align and ABI don't make much sense for individual variants and
should generally be taken from the parent layout instead;
- variants always have `fields: FieldsShape::Arbitrary { .. }` and
`variant: VariantShape::Single { .. }`.
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Enum variant layouts don't need to store a full
LayoutShape; just storing the fields offsets is enough and all other information can be inferred from the parent layout:fields: FieldsShape::Arbitrary { .. }andvariant: VariantShape::Single { .. }.In principle, the same refactor could be done on
rustc_abi::Layout(see this comment) but I prefer starting with this smaller change first.