MarkRecursively  6618 src/heap.cc            tracer_->MarkRecursively(p, this);
MarkRecursively  6668 src/heap.cc      MarkRecursively(root, &mark_visitor);
MarkRecursively  6725 src/heap.cc      MarkRecursively(&map, mark_visitor);
MarkRecursively  2714 src/heap.h       void MarkRecursively(Object** p, MarkVisitor* mark_visitor);