debugger: use extractFields instead of gdb.Type.fields()

http://sourceware.org/bugzilla/show_bug.cgi?id=10953 does not seem to
be fixed in gdb 7.2.

Change-Id: I061fa560ab6cec93f4aa3ae3805668e5e787a2cd
Reviewed-on: http://codereview.qt.nokia.com/3271
Reviewed-by: hjk <qthjk@ovi.com>

share/qtcreator/dumper/dumper.py

@@ -1485,8 +1485,8 @@ class Dumper:
         #warn("INAME: %s " % self.currentIName)
         #warn("INAMES: %s " % self.expandedINames)
         #warn("EXPANDED: %s " % (self.currentIName in self.expandedINames))
-        #fields = extractFields(type)
-        fields = type.fields()
+        fields = extractFields(type)
+        #fields = type.fields()
 
         self.putType(typeName)
         self.putAddress(value.address)