Sema: Fix a regression in -require-explicit-availability
diagnostics
#80481
+32
−14
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The changes in #80040 caused the compiler to start diagnosing extensions containing only members that are either
@_spi
,@_alwaysEmitIntoClient
, or unavailable when the-require-explicit-availability
flag is passed. Extensions should not be diagnosed when they only contain members that would not be diagnosed themselves.Resolves rdar://148275432.