[Bug middle-end/66588] combine should try transforming if_then_else of zero_extends into zero_extend of if_then_else

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66588

--- Comment #6 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Yeah let's close this.  Thanks.