GCType           3087 include/v8.h         GCPrologueCallback callback, GCType gc_type_filter = kGCTypeAll);
GCType           3116 include/v8.h         GCEpilogueCallback callback, GCType gc_type_filter = kGCTypeAll);
GCType            827 src/heap.cc      GCType gc_type =
GCType           1103 src/heap.h           GCEpilogueCallback callback, GCType gc_type_filter);
GCType           1107 src/heap.h           GCEpilogueCallback callback, GCType gc_type_filter);
GCType           1779 src/heap.h         GCPrologueCallbackPair(GCPrologueCallback callback, GCType gc_type)
GCType           1786 src/heap.h         GCType gc_type;
GCType           1791 src/heap.h         GCEpilogueCallbackPair(GCEpilogueCallback callback, GCType gc_type)
GCType           1798 src/heap.h         GCType gc_type;