[ClangImporter] call addImplicitDestructor() on imported CF types.

Author: graydon

lib/ClangImporter/ImportDecl.cpp

@@ -4970,6 +4970,7 @@ SwiftDeclConverter::importCFClassType(const clang::TypedefNameDecl *decl,
     }
   }
 
+  theClass->addImplicitDestructor();
   return theClass;
 }