[objc_direct] fix uniquing when re-declaring a readwrite-direct property #486
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ObjCMethodDecl::getCanonicalDecl() for re-declared readwrite properties,
only looks in the ObjCInterface for the declaration of the setter
method, which it won't find.
When the method is a property accessor, we must look in extensions for a
possible redeclaration.
Radar-Id: rdar://problem/57991337
Differential Revision: https://reviews.llvm.org/D71588