Add an explicit push-argument instruction to the IL.

vm/flow_graph_compiler_ia32.h

Index: vm/flow_graph_compiler_ia32.h
===================================================================
--- vm/flow_graph_compiler_ia32.h	(revision 9930)
+++ vm/flow_graph_compiler_ia32.h	(working copy)
@@ -49,6 +49,9 @@
   }
   static bool CanOptimize();
   bool is_optimizing() const { return is_optimizing_; }
+
+  bool is_ssa() const { return is_ssa_; }
+
   const GrowableArray<BlockInfo*>& block_info() const { return block_info_; }
 
   // Constructor is lighweight, major initialization work should occur here.