Debugger: Recognize QChar as simple type

This avoids creating individual child items when expanding a QString.

Change-Id: I49382dcf947ee7ac0470415a71ab05ede5f71b29
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

share/qtcreator/debugger/dumper.py

@@ -3539,7 +3539,8 @@ class DumperBase():
                 'long long': 'int:8',
                 'unsigned long long': 'uint:8',
                 'float': 'float:4',
-                'double': 'float:8'
+                'double': 'float:8',
+                'QChar': 'uint:2'
             }.get(self.name, None)
             return res