Implement ES11 globalThis (#4306)

Also improve symbol built-in instantiation.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

tests/jerry/es.next/global-this.js

@@ -0,0 +1,19 @@
+// 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.
+
+assert(this === globalThis)
+assert(this.globalThis === globalThis)
+
+globalThis = "X"
+assert(globalThis === "X")

tests/test262-esnext-excludelist.xml

@@ -481,8 +481,6 @@
   <test id="built-ins/TypedArrayConstructors/of/custom-ctor-returns-other-instance.js"><reason></reason></test>
   <test id="built-ins/TypedArrayConstructors/of/custom-ctor.js"><reason></reason></test>
   <test id="built-ins/TypedArrayConstructors/of/new-instance-using-custom-ctor.js"><reason></reason></test>
-  <test id="built-ins/global/global-object.js"><reason></reason></test>
-  <test id="built-ins/global/property-descriptor.js"><reason></reason></test>
   <test id="harness/isConstructor.js"><reason></reason></test>
   <test id="language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-async-function.js"><reason></reason></test>
   <test id="language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-function.js"><reason></reason></test>