Auto merge of #43028 - michaelwoerister:dedup-dep-nodes, r=nikomatsakis
incr.comp.: Deduplicate some DepNodes and introduce anonymous DepNodes This is a parallel PR to the pending https://github.com/rust-lang/rust/pull/42769. It implements most of what is possible in terms of DepNode re-opening without having anonymous DepNodes yet (https://github.com/rust-lang/rust/issues/42298). r? @nikomatsakis
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