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

src/x64/lithium-codegen-x64.h

Index: src/x64/lithium-codegen-x64.h
diff --git a/src/x64/lithium-codegen-x64.h b/src/x64/lithium-codegen-x64.h
index a16a1baa94d00e0f85840e28785641b7b937b4d9..7c9f2a03a07416bcf92a9bff4db06300f4205f61 100644
--- a/src/x64/lithium-codegen-x64.h
+++ b/src/x64/lithium-codegen-x64.h
@@ -249,7 +249,10 @@ 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