[IRGen] Augment opaque type descriptor to support limited availability underlying types #42104
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…y underlying types If particular opaque type descriptor has multiple conditionally available underlying types, emit a special type and witness reference accessors that would be called at runtime to determine actual underlying type.
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If particular opaque type descriptor has multiple conditionally available
underlying types, emit a special type and witness reference accessors that
would be called at runtime to determine actual underlying type.