Implement two-argument check inline cache.

vm/code_generator_ia32.h

Index: vm/code_generator_ia32.h
===================================================================
--- vm/code_generator_ia32.h	(revision 2318)
+++ vm/code_generator_ia32.h	(working copy)
@@ -170,7 +170,8 @@
                             intptr_t token_index,
                             const String& function_name,
                             int num_arguments,
-                            const Array& optional_arguments_names);
+                            const Array& optional_arguments_names,
+                            intptr_t num_checks);

[regis, 2011/12/09 23:08:03]

Would it be possible to spare this additional argument and derive it from
function_name and num_arguments?

The name "num_checks" does not say much. What kind of checks?

[srdjan, 2011/12/12 17:19:33]

num_checks -> num_args_checked, added comment as well.

I do no think that is simple to derive num_args_checked from the function_name
and num_arguments. It seems more reliable if that knowledge is embedded in the
appropriate visitor method.

 
   void GenerateInstanceOf(intptr_t node_id,
                           intptr_t token_index,