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b65fab6299
`rustc_errors` depends on numerous crates, solely to implement its `IntoDiagArg` trait on types from those crates. Many crates depend on `rustc_errors`, and it's on the critical path. We can't swap things around to make all of those crates depend on `rustc_errors` instead, because `rustc_errors` would end up in dependency cycles. Instead, move `IntoDiagArg` into `rustc_error_messages`, which has far fewer dependencies, and then have most of these crates depend on `rustc_error_messages`. This allows `rustc_errors` to drop dependencies on several crates, including the large `rustc_target`. (This doesn't fully reduce dependency chains yet, as `rustc_errors` still depends on `rustc_hir` which depends on `rustc_target`. That will get fixed in a subsequent commit.)