[Bug target/59078] autoincrement feature of NEON store instructions is not used

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59078

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note the use of autoincrement here might actually be slower due to dependent
between instructions.