Clean up runtime functions.

src/arguments.h

Index: src/arguments.h
diff --git a/src/arguments.h b/src/arguments.h
index c80548f4672c720352d2bba790c9b5e8661fca73..a7a30e297dc80db801d9a3307a893cec767c5af7 100644
--- a/src/arguments.h
+++ b/src/arguments.h
@@ -99,8 +99,17 @@ class CustomArguments : public Relocatable {
   Object* values_[3];
 };
 
-#define RUNTIME_CALLING_CONVENTION Arguments args, Isolate* isolate
-#define RUNTIME_GET_ISOLATE ASSERT(isolate == Isolate::Current())
+
+#define DECLARE_RUNTIME_FUNCTION(Type, Name)    \
+Type Name(Arguments args, Isolate* isolate)
+
+
+#define RUNTIME_FUNCTION(Type, Name)            \
+Type Name(Arguments args, Isolate* isolate)
+
+
+#define RUNTIME_ARGUMENTS(isolate, args) args, isolate
+
 
 } }  // namespace v8::internal