Tests: Fix QThread dumper for old gdb (~7.4)

Change-Id: Ifbaf8f326744e9e271b407d8650ffcc47b890889
Reviewed-by: hjk <hjk121@nokiamail.com>

share/qtcreator/debugger/gdbbridge.py

@@ -855,7 +855,9 @@ class Dumper(DumperBase):
             pass
         # Older GDB ~7.4
         try:
-            return gdb.parse_and_eval(symbolName)
+            address = gdb.parse_and_eval("&'%s'" % symbolName)
+            type = gdb.lookup_type(self.qtNamespace() + "QMetaObject")
+            return self.createPointerValue(address, type)
         except:
             return 0