Fix issue with optional named parameters.

runtime/vm/flow_graph_compiler_x64.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "lib/error.h"
@@ skipping 618 matching lines @@
   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;
   int implicit_this_param_pos = is_native_instance_closure ? -1 : 0;
   ASSERT(parsed_function().first_parameter_index() ==
          ParsedFunction::kFirstLocalSlotIndex + implicit_this_param_pos);
 
   // Check that min_num_pos_args <= num_pos_args <= max_num_pos_args,
   // where num_pos_args is the number of positional arguments passed in.
   const int min_num_pos_args = num_fixed_params;
-  const int max_num_pos_args = num_fixed_params + num_opt_pos_params +
-      (FLAG_reject_named_argument_as_positional ? 0 : num_opt_named_params);
+  const int max_num_pos_args = num_fixed_params + num_opt_pos_params;
 
   // Number of positional args is the second Smi in descriptor array (R10).
   __ movq(RCX, FieldAddress(R10, Array::data_offset() + (1 * kWordSize)));
   // Check that min_num_pos_args <= num_pos_args.
   Label wrong_num_arguments;
   __ cmpq(RCX, Immediate(Smi::RawValue(min_num_pos_args)));
   __ j(LESS, &wrong_num_arguments);
   // Check that num_pos_args <= max_num_pos_args.
   __ cmpq(RCX, Immediate(Smi::RawValue(max_num_pos_args)));
   __ j(GREATER, &wrong_num_arguments);
@@ skipping 716 matching lines @@
 void ParallelMoveResolver::Exchange(const Address& mem1, const Address& mem2) {
   __ Exchange(mem1, mem2);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64