[Bug middle-end/41098] We should be better in folding pow with integer powers

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41098

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So we have in forwprop4:
  powmult_14 = x_8(D) * x_8(D);
  powmult_3 = powmult_14 * powmult_14;
  powroot_16 = __builtin_sqrt (powmult_3);
  powroot_17 = __builtin_sqrt (powroot_16);
  if (x_8(D) != powroot_17)