Support large objects in the serializer/deserializer.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 956b8595c3e93246fd247767a8b3327de04ccfd3..bfc5b10c044a9c63cd482d1ddefcf9db2e99c5e8 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -1662,6 +1662,9 @@ class Heap {
   MUST_USE_RESULT inline AllocationResult AllocateRaw(
       int size_in_bytes, AllocationSpace space, AllocationSpace retry_space);
 
+  inline HeapObject* ForceAllocateLargeObject(int size_in_bytes,
+                                              Executability executable);
+
   // Allocates a heap object based on the map.
   MUST_USE_RESULT AllocationResult
       Allocate(Map* map, AllocationSpace space,
@@ -2021,6 +2024,7 @@ class Heap {
   int gc_callbacks_depth_;
 
   friend class AlwaysAllocateScope;
+  friend class Deserializer;
   friend class Factory;
   friend class GCCallbacksScope;
   friend class GCTracer;