Add a getter for QObjectPrivate::threadData

Strictly a temporary measure to deal with cross-module merges.

Change-Id: I344bb3f20f68f04367041834e608669122ff70b1
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/kernel/qobject_p.h

@@ -374,6 +374,7 @@ public:
     }
 public:
     ExtraData *extraData;    // extra data set by the user
+    QThreadData *getThreadData() const { return threadData; }
     QThreadData *threadData; // id of the thread that owns the object
 
     using ConnectionDataPointer = QExplicitlySharedDataPointer<ConnectionData>;