Rollup merge of #160504 - lcnr:borrowck-cleanup, r=oli-obk cleanup borrowck, improve c-variadic handling The first commits of rust-lang/rust#160491. Hopefully all of them make sense. It feels intuitive to me that the `c-variadic` region should be just another late-bound region and tracking region correctly for rust-lang/rust#160491 is otherwise a mess. r? types
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