[Bug testsuite/82951] gcc.c-torture/execute/20040409-1.c undefined behavior

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82951

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, on RTL signs do not matter.  I'd say strip the bogus cases from the
existing tests and "duplicate" them into new variants using -fwrapv?  Thus only
apply -fwrapv to those cases that need it.