[Sema] NFC: Ensure that Decls have one-way validation state #15427
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I also tried to move the early attribute validation bit into this enum, but as it turns out, decls aren't consistent about when they do early attribute checking relative to calling
setIsBeingValidated()
. Some do early attribute checking before validation, others do it after, and some do it during. I tried to make early attribute checking be consistently early, but that broke a few tests.