Add an explicit push-argument instruction to the IL.

vm/flow_graph_compiler.cc

Index: vm/flow_graph_compiler.cc
===================================================================
--- vm/flow_graph_compiler.cc	(revision 9930)
+++ vm/flow_graph_compiler.cc	(working copy)
@@ -599,7 +599,7 @@
       locs->set_in(i, Location::RegisterLocation(reg));
     }
 
-    Pop(reg, instr->InputAt(i));
+    if (!instr->IsPushArgument()) Pop(reg, instr->InputAt(i));

[Kevin Millikin (Google), 2012/07/26 13:03:18]

This deserves some small comment like: "Inputs are consumed immediately at their
use except for outgoing arguments, which are consumed after the call is
completed."

[Florian Schneider, 2012/07/26 13:45:24]

Done.

   }
 
   // If this instruction is call spill everything that was not consumed by