[Bug middle-end/68392] ICE: SIGSEGV in update_uses (fwprop.c:896) with -fno-checking

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68392

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's because

      gcc_checking_assert (sparseset_bit_p (active_defs_check, regno));

has been inconsistently converted with the ENABLE_CHECING transform as we have

  if (flag_checking)
    active_defs_check = sparseset_alloc (max_reg_num ());

but gcc_checking_assert is keyed on CHECKING_P, not flag_checking.