Limit the maximum number of formal parameters (32K fixed and 32K optional)

runtime/vm/ast_printer.cc

Index: runtime/vm/ast_printer.cc
===================================================================
--- runtime/vm/ast_printer.cc	(revision 12282)
+++ runtime/vm/ast_printer.cc	(working copy)
@@ -449,10 +449,7 @@
   }
   OS::Print("llev %d ", scope->loop_level());
   const int num_fixed_params = function.num_fixed_parameters();
-  const int num_opt_pos_params = function.num_optional_positional_parameters();
-  const int num_opt_named_params = function.num_optional_named_parameters();
-  const int num_params =
-      num_fixed_params + num_opt_pos_params + num_opt_named_params;
+  const int num_params = num_fixed_params + function.NumOptionalParameters();
   // Parameters must be listed first and must all appear in the top scope.
   ASSERT(num_params <= scope->num_variables());
   int pos = 0;  // Current position of variable in scope.