Debugger: Show item count with Qt4's QMap

Contents is still wrong for Clang builds as the
debug information recorded for the node types
is insufficient.

Change-Id: I4c694e5010ade7f3ebbb4a94163d7b44da13c10d
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

share/qtcreator/debugger/qttypes.py

@@ -940,8 +940,9 @@ def qdump__QMapNode(d, value):
 
 
 def qdumpHelper__Qt4_QMap(d, value):
-    d_ptr = value["d"].dereference()
-    e_ptr = value["e"].dereference()
+    anon = d.childAt(value, 0)
+    d_ptr = anon["d"].dereference()
+    e_ptr = anon["e"].dereference()
     n = int(d_ptr["size"])
     d.check(0 <= n and n <= 100*1000*1000)
     d.checkRef(d_ptr["ref"])