Rollup of 5 perf-sensitive pull requests - #165107

Rollup of 5 perf-sensitive pull requests#165107

rust-bors[bot] merged 30 commits into

rust-lang:mainrust-lang/rust:mainfrom

JonathanBrouwer:rollup-51xMab4JonathanBrouwer/rust:rollup-51xMab4Copy head branch name to clipboard