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/class-super-access-direct.js

@@ -0,0 +1,102 @@
+// 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.
+
+class Base {
+  constructor () {
+    this.parent_value = 100;
+  }
+
+  parent_value () {
+    return this.parent_value;
+  }
+
+  parent_value_arg (a, b, c) {
+    if (c) {
+      return this.parent_value + a + b + c;
+    } else if (b) {
+      return this.parent_value + a + b;
+    } else {
+      return this.parent_value + a;
+    }
+  }
+
+  method () {
+    return {
+      method: function (a, b, c, d, e) { return -50 + a + b + c + d + e; }
+    }
+  }
+}
+
+class Target extends Base {
+  constructor () {
+    super ();
+    this.parent_value = -10;
+  }
+
+  parent_value () {
+    throw new Error ('(parent_value)');
+  }
+
+  parent_value_direct () {
+    return super.parent_value ();
+  }
+
+  parent_value_direct_arg (a, b, c) {
+    if (c) {
+      return super.parent_value_arg (a, b, c);
+    } else if (b) {
+      return super.parent_value_arg (a, b);
+    } else {
+      return super.parent_value_arg (a);
+    }
+  }
+
+  method () {
+    throw new Error ("(method)");
+  }
+
+  parent_method_dot () {
+    return super.method ().method (1, 2, 3, 4, 5)
+  }
+
+  parent_method_index () {
+    return super['method']()['method'](1, 2, 3, 4, 5);
+  }
+}
+
+
+var obj = new Target ();
+
+assert (obj.parent_value_direct () === -10);
+assert (obj.parent_value_direct_arg (1) === -9);
+assert (obj.parent_value_direct_arg (1, 2) === -7);
+assert (obj.parent_value_direct_arg (1, 2, 3) === -4);
+
+try {
+  obj.parent_value();
+  assert (false)
+} catch (ex) {
+  /* 'obj.parent_value is a number! */
+  assert (ex instanceof TypeError);
+}
+
+assert (obj.parent_method_dot () === -35);
+assert (obj.parent_method_index () === -35);
+
+try {
+  obj.method ();
+  assert (false);
+} catch (ex) {
+  assert (ex.message === '(method)');
+}