sink_phidep        43 lj_opt_sink.c    if (ir->op1 >= REF_FIRST && sink_phidep(J, ir->op1)) return 1;
sink_phidep        44 lj_opt_sink.c    if (ir->op2 >= REF_FIRST && sink_phidep(J, ir->op2)) return 1;
sink_phidep        59 lj_opt_sink.c      return ref < J->loopref && !sink_phidep(J, ref);