VISIT_ALL_IN_SCAVENGE 1256 src/heap.cc      IterateRoots(&scavenge_visitor, VISIT_ALL_IN_SCAVENGE);
VISIT_ALL_IN_SCAVENGE 5666 src/heap.cc      if (mode != VISIT_ALL_IN_SCAVENGE &&
VISIT_ALL_IN_SCAVENGE 5706 src/heap.cc      if (mode != VISIT_ALL_IN_SCAVENGE) {
VISIT_ALL_IN_SCAVENGE 5716 src/heap.cc        case VISIT_ALL_IN_SCAVENGE: