Rollup merge of #158877 - Enselic:adjust-best_blame_constraint, r=fee1-dead borrowck: Keep returned `path` from `best_blame_constraint()` consistent The function `fn best_blame_constraint()` returns a `Vec<OutlivesConstraint>` and a `BlameConstraint`. The `BlameConstraint` is really just a slimmed down version of an `OutlivesConstraint`. So we can remove `BlameConstraint` entirely and instead return `Vec<OutlivesConstraint>` and an index into that `Vec`. (Encapsulated in a struct for nice ergonomics.) To prepare for that, change the code to adjust `Vec<OutlivesConstraint>` in-place and return info about the adjusted element, rather than returning info for a newly created "fake" `OutlivesConstraint`. It is slightly sad that we make `path` `mut`, but I think we can live with that. Diagnostics tests will surely catch if someone messes up because of that. This takes us one step closer (this is commit 2 of 4) towards the end result illustrated in https://github.com/rust-lang/rust/pull/158623.
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