[new regalloc]: Miscompile for s390x

[Hartmut Penner]

>>       while running regtest for S390x on the regalloc branch, found that
>> c-format.c is miscompiled.
>> Boiled it down to following:

>Many thanks for the very helpful analyze.  The below diff (which I checked
>in) should help here.

Now bootstrap and regtest sucessfully on s390 ans s390x
(beside some known problems like scan-assembler...)


Mit freundlichem Gruß / Best regards,

Hartmut Penner
GCC for S/390 Development

Internet Mail Address : hpenner@de.ibm.com

Tel: (49)-7031-16-4364