[Bug tree-optimization/91975] worse code for small array copy using pointer arithmetic than array indexing

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91975

--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
On GCC 10.0 trunk, f0 is not unrolled anymore (as it is with GCC 9.2).  g0 is
still not unrolled.  All other functions are still unrolled as before in GCC
10.