[Bug rtl-optimization/124020] Improve bitmanip recognition for riscv

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124020

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
  _10 = ~_24;


  if (_27 != 0)
    goto <bb 5>; [50.00%]
  else
    goto <bb 6>; [50.00%]

  <bb 5> [local count: 477815112]:
  _12 = pretmp_20 | _24;
  goto <bb 7>; [100.00%]

  <bb 6> [local count: 477815112]:
  _11 = _10 & pretmp_20;

  <bb 7> [local count: 955630224]:
  # _13 = PHI <_11(6), _12(5)>