Implement the Set builtin object (#2841)

Also implement the missing iterator initializer part from the Map builtin object constructor.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

jerry-core/ecma/builtin-objects/ecma-builtin-map.c

@@ -15,7 +15,7 @@
 
 #include "ecma-builtins.h"
 #include "ecma-exceptions.h"
-#include "ecma-map-object.h"
+#include "ecma-container-object.h"
 
 #if ENABLED (JERRY_ES2015_BUILTIN_MAP)
 
@@ -59,7 +59,7 @@ ecma_value_t
 ecma_builtin_map_dispatch_construct (const ecma_value_t *arguments_list_p, /**< arguments list */
                                      ecma_length_t arguments_list_len) /**< number of arguments */
 {
-  return ecma_op_map_create (arguments_list_p, arguments_list_len);
+  return ecma_op_container_create (arguments_list_p, arguments_list_len, false);
 } /* ecma_builtin_map_dispatch_construct */
 
 /**