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

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 a0660b84095ff8924693592d25e726bf9acc1b9c..eaab52e2f17bf96f4a87adaf83008591b99fac7f 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -1700,11 +1700,17 @@ class LSmiTag: public LTemplateInstruction<1, 1, 0> {
 
 class LNumberUntagD: public LTemplateInstruction<1, 1, 0> {
  public:
-  explicit LNumberUntagD(LOperand* value) {
+  LNumberUntagD(LOperand* value, bool deoptimize_on_undefined)
+      : deoptimize_on_undefined_(deoptimize_on_undefined) {
     inputs_[0] = value;
   }
 
+  bool deoptimize_on_undefined() { return deoptimize_on_undefined_; }
+
   DECLARE_CONCRETE_INSTRUCTION(NumberUntagD, "double-untag")
+
+ private:
+  bool deoptimize_on_undefined_;
 };