Add boolean flag to HChange and LNumberUntagD to not convert undefined to NaN.

src/ia32/lithium-codegen-ia32.h

Index: src/ia32/lithium-codegen-ia32.h
diff --git a/src/ia32/lithium-codegen-ia32.h b/src/ia32/lithium-codegen-ia32.h
index 7a7d07a77af9cc7583849b42af1caf45d2f36a54..1a98d8dd61503c058e3fe2e8c97b693ce3306d99 100644
--- a/src/ia32/lithium-codegen-ia32.h
+++ b/src/ia32/lithium-codegen-ia32.h
@@ -261,7 +261,10 @@ class LCodeGen BASE_EMBEDDED {
   void EmitGoto(int block, LDeferredCode* deferred_stack_check = NULL);
   void EmitBranch(int left_block, int right_block, Condition cc);
   void EmitCmpI(LOperand* left, LOperand* right);
-  void EmitNumberUntagD(Register input, XMMRegister result, LEnvironment* env);
+  void EmitNumberUntagD(Register input,
+                        XMMRegister result,
+                        bool deoptimize_on_undefined,
+                        LEnvironment* env);
 
   // Emits optimized code for typeof x == "y".  Modifies input register.
   // Returns the condition on which a final split to