[Bug c/63357] Warn for P && P and P || P (same expression used multiple times in a condition)

[dcb314 at hotmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63357

--- Comment #10 from David Binderman <dcb314 at hotmail dot com> ---
(In reply to Manuel López-Ibáñez from comment #9)
> Please open a new PR mentioning this one.

Done. See 108926.