Remove --harmony-async-await runtime flag

test/mjsunit/es8/regress/regress-624300.js

Index: test/mjsunit/es8/regress/regress-624300.js
diff --git a/test/mjsunit/harmony/regress/regress-624300.js b/test/mjsunit/es8/regress/regress-624300.js
similarity index 88%
rename from test/mjsunit/harmony/regress/regress-624300.js
rename to test/mjsunit/es8/regress/regress-624300.js
index f96fbbb5aaa1a22d4603e0c103372d1333af8f1a..404e2c7f229945ef336da4412ddbb0d36e220f5d 100644
--- a/test/mjsunit/harmony/regress/regress-624300.js
+++ b/test/mjsunit/es8/regress/regress-624300.js
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --harmony-async-await
-
 (function f() {
   try {
     f();