Fix memory leak in ecma_op_object_get_enumerable_property_names (#4136)

JerryScript-DCO-1.0-Signed-off-by: Csaba Osztrogonác csaba.osztrogonac@h-lab.eu

tests/jerry/es.next/object-entries.js

@@ -132,3 +132,15 @@ assert(entries[0][0] === "b");
 assert(entries[0][1] === "bar");
 assert(handlers.length === 3);
 assert(handlers.toString() === "D,D,G");
+
+// exception during enumeration
+var obj = {
+  get a() { throw "error" },
+  get b() { throw "shouldn't run" }
+};
+
+try {
+  Object.entries(obj);
+} catch (err) {
+  assert(err == "error")
+}

tests/jerry/es.next/object-values.js

@@ -125,3 +125,15 @@ assert(values.length === 1);
 assert(values[0] === "bar")
 assert(handlers.length === 3);
 assert(handlers.toString() === "D,D,G");
+
+// exception during enumeration
+var obj = {
+  get a() { throw "error" },
+  get b() { throw "shouldn't run" }
+};
+
+try {
+  Object.values(obj);
+} catch (err) {
+  assert(err == "error")
+}