NLL: rollup a bunch of diagnostic PR's

[pnkfelix]

This is just an issue to ease tracking of the PR's that I'm going to rollup in the near term.

[nikomatsakis]

#54255: spastorino:use-of-moved-value-error

[nikomatsakis]

#54310: pnkfelix:issue-52059-report-borrow-drop-conflict

[nikomatsakis]

#53995 (@pnkfelix crossed off; already merged; bors won the race)

[pnkfelix]

bors won the races