[serializer] reorder some bytecodes to free up large blocks.

src/snapshot/deserializer.cc

Index: src/snapshot/deserializer.cc
diff --git a/src/snapshot/deserializer.cc b/src/snapshot/deserializer.cc
index e8f5c78511ab436a07485cbca24067f3f065e759..42aff945b8c6b2528e70b9a25326a178933841f9 100644
--- a/src/snapshot/deserializer.cc
+++ b/src/snapshot/deserializer.cc
@@ -769,9 +769,8 @@ bool Deserializer::ReadData(Object** current, Object** limit, int source_space,
         int index = data & kHotObjectMask;
         Object* hot_object = hot_objects_.Get(index);
         UnalignedCopy(current, &hot_object);
-        if (write_barrier_needed) {
+        if (write_barrier_needed && isolate->heap()->InNewSpace(hot_object)) {

[vogelheim, 2016/06/22 09:22:31]

I don't understand this change.

(This looks perfectly sensible, but I just don't get why this is needed and how
it relates to the other parts of this CL.)

[Yang, 2016/06/22 09:43:02]

This is just a drive-by fix to adapt this to what we have in other places.

           Address current_address = reinterpret_cast<Address>(current);
-          SLOW_DCHECK(isolate->heap()->ContainsSlow(current_object_address));
           isolate->heap()->RecordWrite(
               HeapObject::FromAddress(current_object_address),
               static_cast<int>(current_address - current_object_address),