SET_OH_BG_PTR     203 gc/backgraph.c     SET_OH_BG_PTR(p, (word)be | FLAG_MANY);
SET_OH_BG_PTR     229 gc/backgraph.c 	SET_OH_BG_PTR(q, p);
SET_OH_BG_PTR     287 gc/backgraph.c         SET_OH_BG_PTR(p, 0);
SET_OH_BG_PTR     309 gc/backgraph.c       SET_OH_BG_PTR(p, 0);