Remove ES_NEXT macro (#4915)

- remove all '#JERRY_ESNEXT' macro
- remove 5.1 build profile, update test runner accordingly (Note: all builtins are turn on by default)
- move tests from tests/jerry/esnext into tests/jerry, concatenate files with same names
- add skiplist to some snapshot tests that were supported only in 5.1
- fix doxygen issues that were hidden before (bc. of es.next macro)

Co-authored-by: Martin Negyokru negyokru@inf.u-szeged.hu
JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

tests/jerry/object-prototype-proto.js

@@ -0,0 +1,89 @@
+// 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.
+
+try {
+  eval('var o = { __proto__ : 5, __proto__ : 5 }');
+  assert(false);
+} catch (e) {
+  assert(e instanceof SyntaxError);
+}
+
+var f = function(){};
+assert((new f()).__proto__ === f.prototype);
+
+var o = {};
+o.__proto__ = Array.prototype;
+assert(o instanceof Array);
+
+var obj = Object.create(null)
+p = {};
+obj.__proto__ = p;
+assert(Object.getPrototypeOf(obj) !== p);
+
+var Circle = function () {};
+var shape = {};
+var circle = new Circle();
+
+shape.__proto__ = circle;
+
+assert(Object.getPrototypeOf(shape) === circle);
+assert(shape.__proto__ === circle);
+
+assert(Object.prototype.hasOwnProperty('__proto__') === true);
+
+var desc = Object.getOwnPropertyDescriptor(Object.prototype,"__proto__");
+assert((desc && "get" in desc && "set" in desc && desc.configurable && !desc.enumerable) === true);
+
+assert((Object.getOwnPropertyNames(Object.prototype).indexOf('__proto__') > -1) === true);
+
+try {
+  shape.__proto__ = shape;
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+var o2 = { ["__proto__"] : null };
+assert(o2.__proto__ === null);
+assert(Object.getPrototypeOf(o2) === Object.prototype);
+
+var o3 = { __proto__ : null };
+assert(o3.__proto__ === undefined);
+assert(Object.getPrototypeOf(o3) === null);
+
+var o4 = { "__proto__" : null };
+assert(o4.__proto__ === undefined);
+assert(Object.getPrototypeOf(o4) === null);
+
+var __proto__ = [];
+var o5 = { __proto__ };
+assert(o5.__proto__ === __proto__);
+assert(Object.getPrototypeOf(o5) === Object.prototype);
+
+var o6 = { __proto__() { return "42" } };
+assert(o6.__proto__() === "42");
+assert(Object.getPrototypeOf(o6) === Object.prototype);
+
+var o7 = { __\u0070r\u006ft\u006f__: null };
+assert(o7.__proto__ === undefined);
+assert(Object.getPrototypeOf(o7) === null);
+
+var o8 = { };
+o8.__proto__ = Array.prototype;
+assert(Object.getPrototypeOf(o8) === Array.prototype);
+
+var str1 = '{"__proto__": [] }';
+var obj1 = JSON.parse(str1);
+assert(Object.getPrototypeOf(obj1) === Object.prototype);
+assert(Array.isArray(obj1.__proto__));