Debugger: Consolidate some GDB-through-Python interaction

Instead of calling a GDB extension command invoking a function
on the well-known Dumper instance, call the Dumper function
directly. This also makes the code more similar to the LLDB side.

Change-Id: I4b23177eb72a904721b63c578ce7fbfe204f02a2
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

src/plugins/debugger/lldb/lldbengine.cpp

@@ -285,7 +285,7 @@ void LldbEngine::setupInferior()
 
     const QString path = stringSetting(ExtraDumperFile);
     if (!path.isEmpty()) {
-        DebuggerCommand cmd("addExtraDumper");
+        DebuggerCommand cmd("addDumperModule");
         cmd.arg("path", path.toUtf8());
         runCommand(cmd);
     }