[snapshot] full setup delegate should also be able to deserialize.

src/snapshot/deserializer.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/snapshot/deserializer.h"
 
 #include "src/api.h"
 #include "src/assembler-inl.h"
 #include "src/bootstrapper.h"
 #include "src/deoptimizer.h"
@@ skipping 74 matching lines @@
 
 void Deserializer::Deserialize(Isolate* isolate) {
   Initialize(isolate);
   if (!ReserveSpace()) V8::FatalProcessOutOfMemory("deserializing context");
   // No active threads.
   DCHECK_NULL(isolate_->thread_manager()->FirstThreadStateInUse());
   // No active handles.
   DCHECK(isolate_->handle_scope_implementer()->blocks()->is_empty());
   // Partial snapshot cache is not yet populated.
   DCHECK(isolate_->partial_snapshot_cache()->is_empty());
+  // Builtins are not yet created.
+  DCHECK(!isolate_->builtins()->is_initialized());
 
   {
     DisallowHeapAllocation no_gc;
     isolate_->heap()->IterateStrongRoots(this, VISIT_ONLY_STRONG_ROOT_LIST);
     isolate_->heap()->IterateSmiRoots(this);
     isolate_->heap()->IterateStrongRoots(this, VISIT_ONLY_STRONG);
     isolate_->heap()->RepairFreeListsAfterDeserialization();
     isolate_->heap()->IterateWeakRoots(this, VISIT_ALL);
     DeserializeDeferredObjects();
     FlushICacheForNewIsolate();
     RestoreExternalReferenceRedirectors(&accessor_infos_);
   }
 
   isolate_->heap()->set_native_contexts_list(
       isolate_->heap()->undefined_value());
   // The allocation site list is build during root iteration, but if no sites
   // were encountered then it needs to be initialized to undefined.
   if (isolate_->heap()->allocation_sites_list() == Smi::kZero) {
     isolate_->heap()->set_allocation_sites_list(
         isolate_->heap()->undefined_value());
   }
 
   // If needed, print the dissassembly of deserialized code objects.
   PrintDisassembledCodeObjects();
 
   // Issue code events for newly deserialized code objects.
   LOG_CODE_EVENT(isolate_, LogCodeObjects());
   LOG_CODE_EVENT(isolate_, LogBytecodeHandlers());
   LOG_CODE_EVENT(isolate_, LogCompiledFunctions());
+
+  isolate_->builtins()->MarkInitialized();
 }
 
 MaybeHandle<Object> Deserializer::DeserializePartial(
     Isolate* isolate, Handle<JSGlobalProxy> global_proxy,
     v8::DeserializeEmbedderFieldsCallback embedder_fields_deserializer) {
   Initialize(isolate);
   if (!ReserveSpace()) {
     V8::FatalProcessOutOfMemory("deserialize context");
     return MaybeHandle<Object>();
   }
@@ skipping 772 matching lines @@
 
       default:
         CHECK(false);
     }
   }
   CHECK_EQ(limit, current);
   return true;
 }
 }  // namespace internal
 }  // namespace v8