[patch] Fix PR testsuite/28950 revised

[Andrew Pinski]

> 
> Janis,
>    Is there a way to have a specific test run from the testsuite 
> rather than having to run the whole set of gcc.dg test over again?
> I'll try the suggested changes but I am hoping to be able to just
> run that one test.

Yes you can find out how by reading:
http://gcc.gnu.org/install/test.html

make check-gcc RUNTESTFLAGS="ppc.exp=file*"

Where ppc.exp is replaced with the .exp file that is being run.
And file is replaced with the start of the testcase file name.

Thanks,
Andrew Pinski