Properly handle primitive arguments in Object methods (#3342)

ES2015 allows primitive arguments for most of the Object built-ins.
This change implements handling for these arguments in affected methods.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu

tests/jerry/es2015/object-methods.js

@@ -0,0 +1,48 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// 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 (JSON.stringify (Object.getOwnPropertyNames("hello")) === '["0","1","2","3","4","length"]');
+
+var n = Object.assign(42, {a: "str"});
+assert (n instanceof Number);
+assert (n.valueOf() === 42);
+assert (n.a === "str");
+
+assert (JSON.stringify (Object.getOwnPropertySymbols("hello")) === '[]');
+
+assert (JSON.stringify (Object.keys("str")) === '["0","1","2"]');
+
+var d = Object.getOwnPropertyDescriptor("hello", '1');
+assert (d.value === "e");
+assert (d.writable === false);
+assert (d.enumerable === true);
+assert (d.configurable === false);
+
+assert (Object.seal(42) === 42);
+assert (Object.seal(undefined) === undefined);
+
+assert (Object.isSealed(42) === true);
+assert (Object.isSealed(undefined) === true);
+
+assert (Object.freeze(42) === 42);
+assert (Object.freeze(undefined) === undefined);
+
+assert (Object.isFrozen(42) === true);
+assert (Object.isFrozen(undefined) === true);
+
+assert (Object.preventExtensions(42) === 42);
+assert (Object.preventExtensions(undefined) === undefined);
+
+assert (Object.isExtensible(42) === false);
+assert (Object.isExtensible(undefined) === false);