Correctly set flags of identifiers related to classes (#4233)

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

tests/jerry/es.next/class-fields4.js

@@ -0,0 +1,82 @@
+// 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.
+
+try {
+  {
+    A;
+    class A { }
+  }
+  assert(false)
+} catch (e) {
+  assert(e instanceof ReferenceError)
+}
+
+try {
+  {
+    class A { [A] () {} }
+  }
+  assert(false)
+} catch (e) {
+  assert(e instanceof ReferenceError)
+}
+
+try {
+  {
+    var a = class A { [A] () {} }
+  }
+  assert(false)
+} catch (e) {
+  assert(e instanceof ReferenceError)
+}
+
+{
+  class C {
+    a = C
+    static b = C
+  }
+
+  var X = C
+  C = 6
+  var c = new X
+
+  assert(X.b === X)
+  assert(c.a === X)
+}
+
+{
+  let a = 6
+  let b = 7
+  class C {
+    p = a + b
+  }
+  assert((new C).p === 13)
+}
+
+try {
+  {
+    class C { static a = C = 5  }
+  }
+  assert(false)
+} catch (e) {
+  assert(e instanceof TypeError)
+}
+
+try {
+  {
+    class C { static [C = 5] = 6 }
+  }
+  assert(false)
+} catch (e) {
+  assert(e instanceof ReferenceError)
+}