[Bug rtl-optimization/70134] combine misses jump optimization on powerpc64le

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70134

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The reason why it is missed on the tree level is due to the code being
undefined.  In that it uses uninitialized variables like:
  if (iter_5(D) >= itmx_6(D))
    goto <bb 10>;
  else
    goto <bb 7>;