Rollup of 4 pull requests#94666

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matthiaskrgr wants to merge 9 commits intorust-lang:masterfrom

matthiaskrgr:rollup-i6lk6gl

Commits on Jan 29, 2022

Add Result::{ok, err, and, or, unwrap_or} as const
clarfonthey
committed

Commits on Mar 4, 2022

Support RelWithDebInfo for lld.
ridwanabdillahi
committed

Commits on Mar 5, 2022