VM: New calling convention for generated code.

runtime/vm/dart_entry.h

Index: runtime/vm/dart_entry.h
diff --git a/runtime/vm/dart_entry.h b/runtime/vm/dart_entry.h
index f88a416f93134a4d6b1d4b0df6e87cabb7479934..12c0d4f4f3057d92974167bc82a1e5a4b9f2a1c8 100644
--- a/runtime/vm/dart_entry.h
+++ b/runtime/vm/dart_entry.h
@@ -100,10 +100,18 @@ class ArgumentsDescriptor : public ValueObject {
 class DartEntry : public AllStatic {
  public:
   // On success, returns a RawInstance.  On failure, a RawError.
+#if defined(TARGET_ARCH_X64)
+  typedef RawObject* (*invokestub)(const Code& stub_code,
+                                   const Code& target_code,
+                                   const Array& arguments_descriptor,
+                                   const Array& arguments,
+                                   Thread* thread);
+#else
   typedef RawObject* (*invokestub)(uword entry_point,
                                    const Array& arguments_descriptor,
                                    const Array& arguments,
                                    Thread* thread);
+#endif
 
   // Invokes the specified instance function or static function.
   // The first argument of an instance function is the receiver.