[Bug target/65951] [AArch64] Will not vectorize multiplication by long constant

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65951

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is a better example for AARCH64 due to ILP32 using long as 32bits:
void
foo (long long *arr)
{
  for (int i = 0; i < 256; i++)
    arr[i] *= 19594LL;
}