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/function-arguments-caller.js

@@ -0,0 +1,66 @@
+// 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 f_simple () {
+}
+
+function f_strict () {
+  "use strict";
+}
+
+try {
+  Function.prototype["arguments"];
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+assert(f_simple["arguments"] === null);
+
+try {
+  f_strict["arguments"];
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+let desc = Object.getOwnPropertyDescriptor(f_simple, "arguments");
+assert(desc.value === null);
+assert(desc.writable === false);
+assert(desc.enumerable === false);
+assert(desc.configurable === false);
+assert(Object.getOwnPropertyDescriptor(f_strict, "arguments") === undefined);
+
+try {
+  Function.prototype["caller"];
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+assert(f_simple["caller"] === undefined);
+
+try {
+  f_strict["caller"];
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+desc = Object.getOwnPropertyDescriptor(f_simple, "caller");
+assert(desc.value === undefined);
+assert(desc.writable === false);
+assert(desc.enumerable === false);
+assert(desc.configurable === false);
+assert(Object.getOwnPropertyDescriptor(f_strict, "arguments") === undefined);