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

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
index 087eb74ecae2d928dec5cfe28157a30ee98e77e4..318a51f07f805019ff0719d1509913c32e35adc7 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -1391,13 +1391,24 @@ class LArithmeticT: public LTemplateInstruction<1, 3, 0> {
 };
 
 
-class LReturn: public LTemplateInstruction<0, 2, 0> {
+class LReturn: public LTemplateInstruction<0, 3, 0> {
  public:
-  explicit LReturn(LOperand* value, LOperand* context) {
+  explicit LReturn(LOperand* value, LOperand* context,
+                   LOperand* parameter_count) {
     inputs_[0] = value;
     inputs_[1] = context;
+    inputs_[2] = parameter_count;
   }
 
+  bool has_constant_parameter_count() {
+    return parameter_count()->IsConstantOperand();
+  }
+  LConstantOperand* constant_parameter_count() {
+    ASSERT(has_constant_parameter_count());
+    return LConstantOperand::cast(parameter_count());
+  }
+  LOperand* parameter_count() { return inputs_[2]; }
+
   DECLARE_CONCRETE_INSTRUCTION(Return, "return")
 };