Debugger: Some parser code consolidation

Change-Id: Icd3afb632cb935fdd95f13db91c9c11a3dea732e
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/debugger/watchhandler.h

@@ -50,6 +50,7 @@ public:
     WatchItem();
     WatchItem(const QByteArray &i, const QString &n);
     explicit WatchItem(const WatchData &data);
+    explicit WatchItem(const GdbMi &data);
 
     WatchItem *parentItem() const;
     const WatchModel *watchModel() const;