c/2466 Testsuite failure gcc.c-torture/execute/loop-2b.c -O2

[Billinghurst, David (CRTS)]

Richard Henderson [rth@redhat.com] tells me:

> That bug fails off and on depending on 
> the optimizers that run before and how good a job they do.
> The bug wasn't fixed for 2.95, merely obscured.  Nor was 
> it really broken by the patch you reference in the PR.

so this PR has been analysed, and I guess it can be downgraded or even
closed.