unused comparison warning (bug 62182)

[Arnaud Bienner]

Hi,

I've submitted a patch to bug 62182 [1], and I would like to have some
feedback about it (this is still WIP as noted in the bug).
As it is my first patch to gcc, I'm not sure what is the best way to
discuss/review patches (here or in bugzilla).
Anyway, please let me know your thoughts :)

Arnaud

[1]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62182
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