[Bug tree-optimization/123645] [13/14/15/16 Regression] `a!=0 ? 0 : __builtin_bswap(a)` is producing wrong code and not 0

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123645

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 63369
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63369&action=edit
popcount is older

Dates back to r9-1682-g58f12ec1437329.