Pedro F. Giffuni 9a252f0990 gcc: Make use of TREE_OVERFLOW_P.
While it was brought in r258179 only to fix a build issue,
bringing the rest of the change has the advantage of fixing
GCC/19978.

Obtained from:	gcc 4.3 (rev. 120505; GPLv2)
MFC after:	1 week
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