Auto merge of #138865 - petrochenkov:errwhere, r=jieyouxu

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.

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