SyncTag          8863 src/objects.h    virtual void Synchronize(VisitorSynchronization::SyncTag tag) {}
SyncTag          2328 src/profile-generator.cc     IndexTag(int index, VisitorSynchronization::SyncTag tag)
SyncTag          2331 src/profile-generator.cc     VisitorSynchronization::SyncTag tag;
SyncTag           934 src/profile-generator.h   void SetGcRootsReference(VisitorSynchronization::SyncTag tag);
SyncTag           936 src/profile-generator.h       VisitorSynchronization::SyncTag tag, bool is_weak, Object* child);