[RFC] Fix PR rtl-optimization/33732

[Kenneth Zadeck]

John David Anglin wrote:
>>    FWIW, I'm going to test this patch, but I can't any PA-RISC testing.
>>     
>
> I'll try it tonight.
>
> Thanks,
> Dave
>   
i have done things like this before and it breaks odd ports in odd
ways.  i will not accept this patch until it is tested on many of the ports.

This is also going to slow down the compiler by a percent or two.