Add --jvm argument to retagger

Author: msimacek

mx.graalpython/mx_graalpython.py

@@ -302,6 +302,7 @@ def retag_unittests(args):
     parser.add_argument('--upload-results-to')
     parser.add_argument('--inspect', action='store_true')
     parser.add_argument('-debug-java', action='store_true')
+    parser.add_argument('--jvm', action='store_true')
     parsed_args, remaining_args = parser.parse_known_args(args)
     env = os.environ.copy()
     env.update(
@@ -320,7 +321,8 @@ def retag_unittests(args):
         'graalpython/com.oracle.graal.python.test/src/tests/test_tagged_unittests.py',
         '--retag'
     ]
-    mx.run([python_svm()] + args + remaining_args, env=env)
+    vm = python_svm() if not parsed_args.jvm else python_gvm_with_assertions()
+    mx.run([vm] + args + remaining_args, env=env)
     if parsed_args.upload_results_to:
         with tempfile.TemporaryDirectory(prefix='graalpython-retagger-') as d:
             filename = os.path.join(d, 'unittest-tags-{}.tar.bz2'.format(sys.platform))