Add shift opcodes handlers

tests/jerry/shift.js

@@ -0,0 +1,21 @@
+// Copyright 2014 Samsung Electronics Co., Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+assert(9 << 2 === 36);
+assert(14 << 2 === 56);
+
+assert(9 >> 2 === 2);
+assert(-14 >> 2 === -4);
+
+assert(9 >>> 2 === 9 >> 2);