dan sinclair b5af23d588 Move diagnostic severity and rule to builtin.
This CL moves DiagnosticSeverity and DiagnosticRule into the builtin::
hierarchy.

Change-Id: I3884046f042d130fa44556f63163f0040381e69c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/120440
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
2023-02-19 17:34:44 +00:00
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