Fix async function call parsing. (#3909)

The "async" identifier processing is delayed until it is detected that it cannot
be part of an arrow expression. The "async" identifier should be processed at this
point, but it was not happened in this case.

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

jerry-core/parser/js/js-scanner-ops.c

@@ -242,6 +242,12 @@ scanner_check_arrow_arg (parser_context_t *context_p, /**< context */
   scanner_pop_literal_pool (context_p, scanner_context_p);
 
   parser_stack_pop_uint8 (context_p);
+
+  if (context_p->stack_top_uint8 == SCAN_STACK_USE_ASYNC)
+  {
+    scanner_add_async_literal (context_p, scanner_context_p);
+  }
+
   parser_stack_push_uint8 (context_p, SCAN_STACK_PAREN_EXPRESSION);
 
   if (process_arrow)