[5.1] [Sema] Bail early in exportability checker if there's no extended type #25395
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I'm unable to reproduce this or figure out exactly when it happens, but in some circumstances we might form an extension that is marked valid but that doesn't have an extended nominal type. Add an assertion here, but don't crash if we see one of these. rdar://50401284
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harlanhaskins
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I'm unable to reproduce this or figure out exactly when it happens, but in some
circumstances we might form an extension that is marked valid but that
doesn't have an extended nominal type. Add an assertion here, but don't
crash if we see one of these.
rdar://50401284
Reviewed by @jrose-apple