savedLR            26 gc/darwin_stop_world.c   unsigned long	savedLR;
savedLR            58 gc/darwin_stop_world.c     if ((frame->savedLR & ~3) == 0) break; /* if the next LR is bogus, stop */
savedLR            59 gc/darwin_stop_world.c     if ((~(frame->savedLR) & ~3) == 0) break; /* ditto */