Fix third parameter of forEach callback function in Map and Set (#3565)

There was a problem with passing third parameter to callback.

This patch fixes #3564

JerryScript-DCO-1.0-Signed-off-by: Rafal Walczyna r.walczyna@samsung.com

tests/jerry/es2015/set.js

@@ -118,3 +118,11 @@ try {
 Set.prototype.add = add;
 
 assert(closed === true);
+
+/* Test third argument of callback */
+var s = new Set([1, 2, 3]);
+
+s.forEach(function(value, key, thisArg) {
+  assert (typeof thisArg === "object");
+  assert(thisArg === s);
+});