Auto merge of #22230 - nikomatsakis:object-lifetime-defaults-2, r=pnkfelix
Implement rules described in rust-lang/rfcs#599. Fixes https://github.com/rust-lang/rust/issues/22211. ~~Based atop PR https://github.com/rust-lang/rust/pull/22182, so the first few commits (up to and including "Pacify the mercilous nrc") have already been reviewed.~~
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