just run 3 iterations on jython

Author: timfel

mx.graalpython/mx_graalpython_benchmark.py

@@ -257,7 +257,7 @@ def __init__(self, config_name, options=None, env=None, iterations=None, host_vm
         GuestVm.__init__(self, host_vm=host_vm)
 
     def override_iterations(self, requested_iterations):
-        return 2
+        return 3
 
     def hosting_registry(self):
         return java_vm_registry
@@ -282,6 +282,7 @@ def run(self, cwd, args):
                 if a.startswith("-D") or a.startswith("-XX"):
                     vm_args.insert(0, a)
                     args.remove(a)
+            args = self._override_iterations_args(args)
             cmd = vm_args + args
 
             if not self._env: