[tuples][patch] Don't create GIMPLE_CONDs that trap

[Rafael Espindola]

>  This (untested) patch should fix the problem.  Rafael could you try this
> one?

This is almost the same as the idea from Richard that I tested on
tuples already (attached).

I am now testing it on trunk. I had to change can_propagate_from to.

Cheers,
-- 
Rafael Avila de Espindola

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