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

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index 853f65657d0741aee5303714b44bfc18e24d38f4..6025df4297c44f4954390cd68d24183bcb59fc8b 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -1649,7 +1649,8 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
   if (from.IsTagged()) {
     if (to.IsDouble()) {
       LOperand* value = UseRegister(instr->value());
-      LNumberUntagD* res = new LNumberUntagD(value);
+      LNumberUntagD* res =
+          new LNumberUntagD(value, instr->deoptimize_on_undefined());
       return AssignEnvironment(DefineAsRegister(res));
     } else {
       ASSERT(to.IsInteger32());