seqc_consistent_no_fence
(!seqc_consistent_no_fence(&(seqcount)->seqc, gen))
if (__predict_false(!seqc_consistent_no_fence(fd_seqc(fdt, fd), seq)))
if (seqc_consistent_no_fence(fd_seqc(fdt, fd), seq))
if (__predict_false(!seqc_consistent_no_fence(fd_seqc(fdt, fd), seq)))
seqc_consistent_no_fence(seqcp, oldseqc); \