[Bug tree-optimization/119733] store-merging increases alignment

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119733

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Without h field, GCC does produce the correct alignment at least on the RTL
level:
```
(insn 7 6 0 (set (reg:DI 98 [ _26 ])
        (mem:DI (reg/v/f:DI 100 [ qD.2840 ]) [0 MEM <unsigned long> [(voidD.54
*)q_2(D)]+0 S8 A16])) "/app/example.c":6:17 -1
     (nil))
```