[SE-0400] All properties with init accessors become part of the memberwise init

Per the clarification during the review thread, all properties with
init accessors (including those that do not initialize any underlying
storage) are part of the memberwise initializer.

lib/Sema/CodeSynthesis.cpp

@@ -1300,10 +1300,6 @@ HasMemberwiseInitRequest::evaluate(Evaluator &evaluator,
       if (!var->isMemberwiseInitialized(/*preferDeclaredProperties=*/true))
         continue;
 
-      // If init accessors are not involved, we are done.
-      if (initializedViaAccessor.empty())
-        return true;
-
       // Check whether use of init accessors results in access to uninitialized
       // properties.