Re-target for ES.Next (#3901)

A list of changes:
- 'es2015-subset' profile is deprecated, and an 'es.next' profile is added.
- The default profile is changed to 'es.next'
- Renamed the JERRY_ES2015 guard to JERRY_ESNEXT
- Renamed JERRY_ES2015_BUILTIN_* guards to JERRY_BUILTIN_*
- Moved es2015 specific tests to a new 'es.next' subdirectory
- Updated docs, targets, and test runners to reflect these changes

Resolves #3737.

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

tests/jerry/es.next/promise-race-iterator.js

@@ -0,0 +1,69 @@
+/* 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.
+ */
+
+function createIterable(arr, methods = {}) {
+  let iterable = function *() {
+    let idx = 0;
+    while (idx < arr.length) {
+      yield arr[idx];
+      idx++;
+    }
+  }();
+  iterable['return'] = methods['return'];
+  iterable['throw'] = methods['throw'];
+
+  return iterable;
+};
+
+// iterator next
+Promise.race({[Symbol.iterator]() { return {get next() { throw 5; }}}
+}).catch(err => {
+  assert(err === 5);
+});
+
+// iterator value
+Promise.race({ [Symbol.iterator] () { return { next () { return { get value () { throw 5 }}}}}
+}).catch(err => {
+  assert(err === 5);
+});
+
+// iterator done
+Promise.race({ [Symbol.iterator] () { return { next () { return { get done () { throw 5 }}}}}
+}).catch(err => {
+  assert(err === 5);
+});
+
+// iterator get
+Promise.race({ get [Symbol.iterator] () { throw 5 }
+}).catch(err => {
+  assert(err === 5);
+});
+
+var fulfills = Promise.race(createIterable([
+  new Promise(resolve => { resolve("foo"); }),
+  new Promise(resolve => { resolve("bar"); }),
+]));
+var rejects = Promise.race(createIterable([
+  new Promise((_, reject) => { reject("baz"); }),
+  new Promise((_, reject) => { reject("qux"); }),
+]));
+
+fulfills.then(result => { assert (result + "" === "foo"); });
+rejects.catch(result => { assert (result === "baz"); });
+
+var closed = false;
+delete Promise.resolve;
+Promise.race(createIterable([1,2,3], {'return': function () { closed = true; }}));
+assert (closed);