[Bug c++/64524] gcc can't detect same expression in both parts of ternary operator

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64524

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is also a style warning.  And really here is another false positive:
#define a 1
#define b 1

int t = c > d ? a : b;