[Bug target/71310] Bitfields cause load hit store with smaller store and larger load

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71310

--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
This happens because of

  /* Find the smallest nice mode to use.  */
  for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
       mode = GET_MODE_WIDER_MODE (mode))
    if (GET_MODE_BITSIZE (mode) >= bitsize)
      break;

in stor-layout.c:finish_bitfield_representative .