Rework built-in processing of JerryScript (#4347)

- All built-ins are native functions now
- Native handlers have a built-in id: ECMA_BUILTIN_ID_HANDLER
- Built-in routine identifiers start from 1
- Built-in routines have an own flag set
- Name property of routines is resolved dynamically
- Style fixes

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

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

@@ -43,7 +43,7 @@
  */
 enum
 {
-  ECMA_ARRAY_ROUTINE_START = ECMA_BUILTIN_ID__COUNT - 1,
+  ECMA_ARRAY_ROUTINE_START = 0,
   ECMA_ARRAY_ROUTINE_IS_ARRAY,
 #if ENABLED (JERRY_ESNEXT)
   ECMA_ARRAY_ROUTINE_FROM,
@@ -544,8 +544,7 @@ ecma_builtin_array_dispatch_construct (const ecma_value_t *arguments_list_p, /**
  *         Returned value must be freed with ecma_free_value.
  */
 ecma_value_t
-ecma_builtin_array_dispatch_routine (uint16_t builtin_routine_id, /**< built-in wide routine
-                                                                   *   identifier */
+ecma_builtin_array_dispatch_routine (uint8_t builtin_routine_id, /**< built-in wide routine identifier */
                                      ecma_value_t this_arg, /**< 'this' argument value */
                                      const ecma_value_t arguments_list_p[], /**< list of arguments
                                                                              *   passed to routine */