rustc_metadata: replace Entry table with one table for each of its fields (AoS -> SoA).#59953

Merged

bors merged 13 commits intorust-lang:masterfrom eddyb:soa-metadata

Oct 17, 2019

+857-876

Commits on Oct 15, 2019

rustc_metadata: remove now-redundant length from the start of the encoding.
eddyb
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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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rustc_metadata: don't use more space than needed, for each Table.
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rustc_metadata: address some review comments.
eddyb
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