Roman Lebedev 84b4f5a6a6 [InstCombine] Negator: while there, add detection for cycles during negation ...

I don't have any testcases showing it happening,
and i haven't succeeded in creating one,
but i'm also not positive it can't ever happen,
and i recall having something that looked like
that in the very beginning of Negator creation.

But since we now already have a negation cache,
we can now detect such cases practically for free.

Let's do so instead of "relying" on stack overflow :D

2020-06-17 22:47:20 +03:00

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