[rustdoc] Box ItemKind to reduce the size of `Item`#80014

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bors merged 2 commits intorust-lang:masterfrom

jyn514:box-item-kind

Dec 29, 2020

Commits on Dec 23, 2020

Box ItemKind to reduce the size of `Item`
jyn514
committed

Commits on Dec 29, 2020

Add static assertion for the size of ItemKind
jyn514
committed