[crankshaft][runtime] Initialize uninitialized double fields with hole NaN value instead of 0.0.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 1fcfdd7675586de2934facc4f0e11f26dd96bc68..2d8faee9821b36cf5dc8f70b5bc41d2c368d443e 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -746,13 +746,10 @@ bool Object::FilterKey(PropertyFilter filter) {
 
 Handle<Object> Object::NewStorageFor(Isolate* isolate, Handle<Object> object,
                                      Representation representation) {
-  if (representation.IsSmi() && object->IsUninitialized(isolate)) {
-    return handle(Smi::kZero, isolate);
-  }
   if (!representation.IsDouble()) return object;
   double value;
   if (object->IsUninitialized(isolate)) {
-    value = 0;
+    value = bit_cast<double>(kHoleNanInt64);
   } else if (object->IsMutableHeapNumber()) {
     value = HeapNumber::cast(*object)->value();
   } else {