Support large objects in the serializer/deserializer.

src/heap/spaces.h

Index: src/heap/spaces.h
diff --git a/src/heap/spaces.h b/src/heap/spaces.h
index 9ecb3c432eb0ac279eeb819e55a80d6d7180a553..e76e09c76d766accedadc2b64511a71e60ad67dd 100644
--- a/src/heap/spaces.h
+++ b/src/heap/spaces.h
@@ -2728,6 +2728,10 @@ class LargeObjectSpace : public Space {
   MUST_USE_RESULT AllocationResult
       AllocateRaw(int object_size, Executability executable);
 
+  void PrepareForDeserialization(int large_objects_total_size);
+
+  bool CanAllocateSize(int size) { return Size() + size <= max_capacity_; }
+
   // Available bytes for objects in this space.
   inline intptr_t Available();