Pass closure object as first implicit argument to closure functions.

runtime/vm/intermediate_language.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_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 2506 matching lines @@
 class NativeCallInstr : public TemplateDefinition<0> {
  public:
   explicit NativeCallInstr(NativeBodyNode* node)
       : ast_node_(*node) {}
 
   DECLARE_INSTRUCTION(NativeCall)
   virtual RawAbstractType* CompileType() const;
 
   intptr_t token_pos() const { return ast_node_.token_pos(); }
 
+  const Function& function() const { return ast_node_.function(); }
+
   const String& native_name() const {
     return ast_node_.native_c_function_name();
   }
 
   NativeFunction native_c_function() const {
     return ast_node_.native_c_function();
   }
 
-  intptr_t argument_count() const { return ast_node_.argument_count(); }
-
-  bool has_optional_parameters() const {
-    return ast_node_.has_optional_parameters();
-  }
-
-  bool is_native_instance_closure() const {
-    return ast_node_.is_native_instance_closure();
-  }
-
   virtual void PrintOperandsTo(BufferFormatter* f) const;
 
   virtual bool CanDeoptimize() const { return false; }
 
   virtual bool HasSideEffect() const { return true; }
 
   virtual intptr_t ResultCid() const { return kDynamicCid; }
 
  private:
   const NativeBodyNode& ast_node_;
@@ skipping 1694 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_