Debugger: Use the usual callback mechanism for LLDB, too

... instead of the custom mechanisms to funnel breakpoint ids, cookies
and similar through individual bridge functions.

Change-Id: I2b6e906078eefdbcd4ffa166dc1881a1d0f7fb51
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

share/qtcreator/debugger/gdbbridge.py

@@ -1665,10 +1665,7 @@ class Dumper(DumperBase):
         gdb.execute("quit")
 
     def loadDumpers(self, args):
-        self.setupDumpers()
-
-    def reportDumpers(self, msg):
-        print(msg)
+        print(self.setupDumpers())
 
     def profile1(self, args):
         """Internal profiling"""