Improve performance of lit_utf8_string_calc_hash_last_bytes.

JerryScript-DCO-1.0-Signed-off-by: Evgeny Gavrin e.gavrin@samsung.com

tests/jerry/hash.js

@@ -0,0 +1,24 @@
+// Copyright 2015 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.
+
+a = {};
+a['12345']=1;
+a['13345']=3;
+a['sss45']=4;
+a['1'] = 2;
+
+assert (a[12345] === 1);
+assert (a[1] === 2);
+assert (a[13345] === 3);
+assert (a['sss45'] === 4);