[Bug tree-optimization/95423] Failure to optimize separated multiplications by x and square of x

[gabravier at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95423

--- Comment #1 from Gabriel Ravier <gabravier at gmail dot com> ---
I've hit a similar thing with this function :

int f(int x)
{
    return (x * x * x) - (3 * x) - 1;
}

Which can be optimized to `return (((x * x) - 3) * x) - 1;`, but isn't