GCEpilogueCallbackPair 6288 src/heap.cc      GCEpilogueCallbackPair pair(callback, gc_type);
GCEpilogueCallbackPair 1791 src/heap.h         GCEpilogueCallbackPair(GCEpilogueCallback callback, GCType gc_type)
GCEpilogueCallbackPair 1794 src/heap.h         bool operator==(const GCEpilogueCallbackPair& pair) const {
GCEpilogueCallbackPair 1800 src/heap.h       List<GCEpilogueCallbackPair> gc_epilogue_callbacks_;