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compiletest: Support matching on diagnostics without a span Using `//~? ERROR my message` on any line of the test. The new checks are exhaustive, like all other `//~` checks, and unlike the `error-pattern` directive that is sometimes used now to check for span-less diagnostics. This will allow to eliminate most on `error-pattern` directives in compile-fail tests (except those that are intentionally imprecise due to platform-specific diagnostics). I didn't migrate any of `error-pattern`s in this PR though, except those where the migration was necessary for the tests to pass.