Suggestion for a fix to Bug middle-end/20177

[E. Weddington]

Richard Kenner wrote:

>    That's one of the
>reasons why very few (any?) machines use CC0 anymore.
>
>  
>
IIUC, according to
<http://gcc.gnu.org/backends.html>
there are 12 targets that use cc0, out of  a list of 32 targets.

Eric