Optional arguments in new compiler.

runtime/vm/flow_graph_compiler_x64.h

 // 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.
 
 #ifndef VM_FLOW_GRAPH_COMPILER_X64_H_
 #define VM_FLOW_GRAPH_COMPILER_X64_H_
 
 #ifndef VM_FLOW_GRAPH_COMPILER_H_
 #error Include flow_graph_compiler.h instead of flow_graph_compiler_x64.h.
 #endif
@@ skipping 79 matching lines @@
                                 const AbstractType& dst_type,
                                 const String& dst_name);
 
   void GenerateInstanceOf(intptr_t node_id,
                           intptr_t token_index,
                           const AbstractType& type,
                           bool negate_result);
 
   void GenerateInstantiatorTypeArguments(intptr_t token_index);
 
+  void CopyParameters();
+
+  intptr_t StackSize() const;
+
   Assembler* assembler_;
   const ParsedFunction& parsed_function_;
   const GrowableArray<BlockEntryInstr*>* blocks_;
 
   // Compiler specific per-block state.  Indexed by block number, so not
   // necessarily the same order as the array of blocks.
   GrowableArray<BlockInfo*> block_info_;
 
   BlockEntryInstr* current_block_;
 
   CodeGenerator::DescriptorList* pc_descriptors_list_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphCompiler);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_COMPILER_X64_H_