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72be0e0851
Normally, Swift cannot import an incomplete type. However, when we are
importing a SWIFT_SHARED_REFERENCE type, we're always dealing with
pointers to the type, and there is no need for the underlying type to
be complete. This permits a common pattern in C libraries where the
actual underlying storage is opaque and all APIs traffic in the
pointer, e.g.,
typedef struct MyTypeImpl *MyType;
void MyTypeRetain(MyType ptr);
void MyTypeRelease(MyType ptr);
to use SWIFT_SHARED_REFERENCE to import such types as foreign
references, rather than as OpaquePointer.
Fixes rdar://155970441.