[RFC] Ignore TREE_CONSTANT_OVERFLOW in integer_zerop

[Falk Hueffner]

Roger Sayle <roger@eyesopen.com> writes:

> [...] the patch below removes the TREE_CONSTANT_OVERFLOW checks from
> integer_zerop, integer_onep, and friends in tree.c.

Incidentally, this fixes PR 26729.

-- 
	Falk