Rollup of 8 pull requests#84966

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GuillaumeGomez wants to merge 18 commits into

rust-lang:masterfrom

GuillaumeGomez:rollup-3u8aw8m

Commits on Apr 19, 2021

Stablize {HashMap,BTreeMap}::into_{keys,values}
Folyd
committed

Commits on Apr 29, 2021

Simplify chdir implementation and minimize unsafe block
joshtriplett
committed

Commits on Apr 30, 2021

Allow using `core::` in intra-doc links within core itself
jyn514
committed

Commits on May 4, 2021

Handle incorrect placement of parentheses in trait bounds more gracefully
estebank
committed
CTFE engine: rename copy → copy_intrinsic, move to intrinsics.rs
RalfJung
committed
Only compute Obligation `cache_key` once in `register_obligation_at`
estebank
committed

Commits on May 5, 2021