debugger: speedup QVariant dumper

Essential for QObject, too.

Change-Id: Ie798227f6c8d07eff37e6dbadb7f6f5baa382ca8
Reviewed-on: http://codereview.qt.nokia.com/851
Reviewed-by: hjk <qthjk@ovi.com>

share/qtcreator/gdbmacros/dumper.py

@@ -1385,6 +1385,10 @@ class Dumper:
             self.currentType = type
             self.currentTypePriority = priority
 
+    def putBetterType(self, type, priority = 0):
+        self.currentType = type
+        self.currentTypePriority = self.currentTypePriority + 1
+
     def putAddress(self, addr):
         if self.printsAddress:
             try: