[serializer] include global proxy in additional context snapshots.

src/heap/heap.cc

 // Copyright 2012 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/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/context-slot-cache.h"
 #include "src/base/bits.h"
@@ skipping 4904 matching lines @@
     v->Synchronize(VisitorSynchronization::kBuiltins);
     isolate_->interpreter()->IterateDispatchTable(v);
     v->Synchronize(VisitorSynchronization::kDispatchTable);
   }
 
   // Iterate over global handles.
   switch (mode) {
     case VISIT_ONLY_STRONG_ROOT_LIST:
       UNREACHABLE();
       break;
+    case VISIT_ONLY_STRONG_FOR_SERIALIZATION:
+      break;
     case VISIT_ONLY_STRONG:
-    case VISIT_ONLY_STRONG_FOR_SERIALIZATION:
       isolate_->global_handles()->IterateStrongRoots(v);
       break;
     case VISIT_ALL_IN_SCAVENGE:
       isolate_->global_handles()->IterateNewSpaceStrongAndDependentRoots(v);
       break;
     case VISIT_ALL_IN_SWEEP_NEWSPACE:
     case VISIT_ALL:
       isolate_->global_handles()->IterateAllRoots(v);
       break;
   }
@@ skipping 1539 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8