Severe problems with vectorizing stuff in 4.0.3 HEAD

[Kean Johnston]

> Can you try -fno-optimize-sibling-calls and see if that works?
Yes, it did, thank you.

> If so, then the problem is that we sibling calls should not be
> done in main.  To fix the testcase anyways to be correct is to
> put "return 0;" after the call to main1.  Since right now the
> return of main could be anything.

I don't think the test case is inocrrect. In a nutshell,
it has:

int main1() {
   ... stuff ...

   return 0;
}

int main(void)
{
   return main1();
}

That should be perfectly valid, and return 0 from main1
which subsequently returns 0 from main.

What does the fact that -fno-optimize-sibling-calls worked
indicate really? Without that option something really does
seem to be mis-calculating the stack offsets by 4. What may
be of interest here is that aside from the vect/* tests,
the only other test that is failing is sibcall-6.

Kean