Rollup of 5 perf-sensitive pull requests - #164931

Rollup of 5 perf-sensitive pull requests#164931

rust-bors[bot] merged 14 commits into

rust-lang:mainrust-lang/rust:mainfrom

JonathanBrouwer:rollup-evgAZRdJonathanBrouwer/rust:rollup-evgAZRdCopy head branch name to clipboard