[Bug tree-optimization/61338] too many permutation in a vectorized "reverse loop"

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61338

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Just the simple:
```
void foo (int *__restrict A, int n) {
    for (int i = n; i > 0; --i) {
        A[i] += 1;
    }
}
```

Produces the double PERM here.

>From PR 115819 .