[Bug rtl-optimization/70782] zero-initialized long returned by value generates useless stores/loads to the stack

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70782

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For the memset/memcpy version, I wonder if we should convert:
  MEM[(char * {ref-all})&v] = _10;
...
  MEM <unsigned int> [(char * {ref-all})&v] = _8;


Into using BIT_FIELD_REF.