Two small fixes for s/390.

[Ulrich Drepper]

"Martin Schwidefsky" <schwidefsky@de.ibm.com> writes:

>      * sysdeps/unix/sysv/linux/s390/profile_counter.h (profil_counter) :
>      Remove high order bit from the program counter for 31 bit.

This part isn't OK.  We don't use #ifdefs to distinguish between
architectures.  Create a separate file or move the existing to 390-64
and create a new one in s390-32.

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