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/promise-species.js

@@ -0,0 +1,53 @@
+/* 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.
+ */
+
+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Test that Promises use @@species appropriately
+
+// Another constructor with no species will not be instantiated
+
+var test = new Promise(function(){});
+var bogoCount = 0;
+function bogusConstructor() { bogoCount++; }
+test.constructor = bogusConstructor;
+assert(Promise.resolve(test) instanceof Promise);
+assert(!(Promise.resolve(test) instanceof bogusConstructor));
+
+// If there is a species, it will be instantiated
+// @@species will be read exactly once, and the constructor is called with a
+// function
+var count = 0;
+var params;
+
+class MyPromise extends Promise {
+  constructor(...args) {
+    super(...args);
+    params = args;
+  }
+  static get [Symbol.species]() {
+    count++
+    return this;
+  }
+}
+
+var myPromise = MyPromise.resolve().then();
+assert(1 === count);
+assert(1 === params.length);
+assert('function' === typeof(params[0]));
+assert(myPromise instanceof MyPromise);
+assert(myPromise instanceof Promise);