bors d692a91fa6 Auto merge of #43590 - michaelwoerister:no-reopening-1, r=nikomatsakis
incr.comp.: Assert that no DepNode is re-opened (see issue #42298).

This PR removes the last occurrence of DepNode re-opening and adds an assertion that prevents our doing so in the future too. The DepGraph should no be guaranteed to be cycle free.

r? @nikomatsakis

EDIT: Closes https://github.com/rust-lang/rust/issues/42298
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