Rework `untranslatable_diagnostic` lint
Currently it only checks calls to functions marked with `#[rustc_lint_diagnostics]`. This PR changes it to check calls to any function with an `impl Into<{D,Subd}iagnosticMessage>` parameter. This greatly improves its coverage and doesn't rely on people remembering to add `#[rustc_lint_diagnostics]`. It also lets us add `#[rustc_lint_diagnostics]` to a number of functions that don't have an `impl Into<{D,Subd}iagnosticMessage>`, such as `Diag::span`.
r? ``@davidtwco``
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| .. | ||
| mbe | ||
| mut_visit | ||
| parse | ||
| tokenstream | ||
| base.rs | ||
| build.rs | ||
| config.rs | ||
| errors.rs | ||
| expand.rs | ||
| lib.rs | ||
| mbe.rs | ||
| module.rs | ||
| placeholders.rs | ||
| proc_macro.rs | ||
| proc_macro_server.rs | ||
| tests.rs | ||