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

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index 69b1c970c6a8759fa79dc2be821ad74a39afbf6a..69a0e7f5fd0650cc6f7bb6d50c470f04372f3dcf 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -1954,7 +1954,9 @@ LInstruction* LChunkBuilder::DoReturn(HReturn* instr) {
   LOperand* context = info()->IsStub()
       ? UseFixed(instr->context(), esi)
       : NULL;
-  return new(zone()) LReturn(UseFixed(instr->value(), eax), context);
+  LOperand* parameter_count = UseRegisterOrConstant(instr->parameter_count());
+  return new(zone()) LReturn(UseFixed(instr->value(), eax), context,
+                             parameter_count);
 }