Debugger: Disable GDB's own pretty printers when use is not wanted

Saves up to 20% on large uniform structures.

Change-Id: I98c8c942f0accac7e2db1d8b06bf7ed156967306
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

share/qtcreator/debugger/gdbbridge.py

@@ -184,7 +184,10 @@ class PlainDumper:
                     d.putSubItem(child[0], child[1])
 
 def importPlainDumpers(args):
-    theDumper.importPlainDumpers()
+    if args == "off":
+        gdb.execute("disable pretty-printer .* .*")
+    else:
+        theDumper.importPlainDumpers()
 
 registerCommand("importPlainDumpers", importPlainDumpers)
 

src/plugins/debugger/gdb/gdbengine.cpp

@@ -1534,7 +1534,9 @@ void GdbEngine::handleStop1(const GdbMi &data)
     if (!m_systemDumpersLoaded) {
         m_systemDumpersLoaded = true;
         if (m_gdbVersion >= 70400 && boolSetting(LoadGdbDumpers))
-            postCommand("importPlainDumpers");
+            postCommand("importPlainDumpers on");
+        else
+            postCommand("importPlainDumpers off");
     }
 
     handleStop2(data);