To fully support hydrogen code stubs which accept a variable number of arguments,

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index c2f3951494e647936183cdb1d25659c8d5ee187f..752d2c5d36e4f6043477ef154583c92769287d74 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -3842,7 +3842,8 @@ bool HOptimizedGraphBuilder::BuildGraph() {
 
   if (current_block() != NULL) {
     HReturn* instr = new(zone()) HReturn(graph()->GetConstantUndefined(),
-                                         context);
+                                         context,
+                                         info()->num_parameters());

[danno, 2013/03/07 15:11:14]

Create a HConstant with this value

[mvstanton, 2013/03/07 16:48:49]

Done.

     current_block()->FinishExit(instr);
     set_current_block(NULL);
   }
@@ -4728,7 +4729,8 @@ void HOptimizedGraphBuilder::VisitReturnStatement(ReturnStatement* stmt) {
     HValue* result = environment()->Pop();
     current_block()->FinishExit(new(zone()) HReturn(
         result,
-        environment()->LookupContext()));
+        environment()->LookupContext(),
+        info()->num_parameters()));

[danno, 2013/03/07 15:11:14]

Create a HConstant with this value

[mvstanton, 2013/03/07 16:48:49]

Done.

   } else if (state->inlining_kind() == CONSTRUCT_CALL_RETURN) {
     // Return from an inlined construct call. In a test context the return value
     // will always evaluate to true, in a value context the return value needs