Rollup of 12 pull requests#82352

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JohnTitor wants to merge 30 commits intorust-lang:masterfrom

JohnTitor:rollup-w02nh68

Commits on Feb 9, 2021

Commits on Feb 10, 2021

Avoid `cfg_if` in `std::os`
jonas-schievink
committed

Commits on Feb 15, 2021

Update RELEASES.md 1.50 to include methods stabilized in #79342
CDirkx
committed

Commits on Feb 16, 2021

Commits on Feb 17, 2021

Commits on Feb 19, 2021

Remove unsafe impl Send for CompletedTest & TestResult
tmiasko
committed

Commits on Feb 20, 2021

Commits on Feb 21, 2021