[harmony] Move some regression tests to the right place

test/mjsunit/es6/regress/regress-347906.js

Index: test/mjsunit/es6/regress/regress-347906.js
diff --git a/test/mjsunit/regress/regress-347906.js b/test/mjsunit/es6/regress/regress-347906.js
similarity index 86%
rename from test/mjsunit/regress/regress-347906.js
rename to test/mjsunit/es6/regress/regress-347906.js
index c751618928c93015679087ee1b500637657aa341..daa62f5df7072d04975252eae14d7a98ba73b3e5 100644
--- a/test/mjsunit/regress/regress-347906.js
+++ b/test/mjsunit/es6/regress/regress-347906.js
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --harmony
+// Flags: --allow-natives-syntax
 
 function foo() {
   return Math.clz32(12.34);