[PATCH] PR12214 - warn on suspicious self-compound-assignments

[Nikola Smiljanic]

> notice that a^=a actually does change the value.
>

We issue the warning only for |= and &= for this reason. The thes for ^= is
there to make sure there's no diagnostic.


> I assume this diagnostic is automatically suppressed in the case that
> we're really calling an overloaded operator|= or something, right?


 I've just tried this and self-assign warning is not issued for overloaded
operators.
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