[WIP] #59953 without the last commit (i.e. missing an optimization)#60029

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eddyb wants to merge 14 commits intorust-lang:masterfrom

eddyb:soa-metadata-minus-last-commit

Commits on Apr 16, 2019

Commits on Apr 17, 2019

rustc_metadata: replace LazySeq<T> with Lazy<[T]>.
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rustc_metadata: use NonZeroUsize for the position of a Lazy.
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rustc_metadata: use 0 in index::Index to indicate missing entries.
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rustc_metadata: rename index::Index to table::Table.
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rustc_metadata: parametrize Table by element type.
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rustc_metadata: replace Lazy<[Table<T>]> with Lazy<Table<T>>.
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rustc_metadata: split tables into an usize-keyed Table and a DefIndex-keyed PerDefTable.
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rustc_metadata: add a helper macro for recording into PerDefTable's.
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rustc_metadata: generalize Table<T> to hold T, not Lazy<T>, elements.
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rustc_metadata: use decoder::Metadata instead of &[u8] for Lazy<Table<T>>::get.
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rustc_metadata: replace Entry table with one table for each of its fields (AoS -> SoA).
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