[Bug middle-end/71509] Bitfield causes load hit store with larger store than load

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71509

--- Comment #12 from Segher Boessenkool <segher at gcc dot gnu.org> ---
But it could do just

  stw r4,0(r3)

(on LE; and with a rotate first, on BE).