[RFC] Ignore TREE_CONSTANT_OVERFLOW in integer_zerop

[Mark Mitchell]

Roger Sayle wrote:

> such a step.  Is such a transition safe for stage 3 mainline,
> and/or would front-ends prefer some time to double check that
> this won't cause problems on conformance tests not part of GCC's
> testsuite.

I think it's reasonable to make this change at this point, as there are
real bugs that you're fixing.  Please do be careful, and please confine
the changes to those that actually fix bugs, rather than just clean-ups
for clean-up sake.

Thanks,

-- 
Mark Mitchell
CodeSourcery
mark@codesourcery.com
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