[PATCH 2/2] S390: Use generic spinlock code.

[Stefan Liebler]

This is an updated version of the patch, which adjusts the s390 specific 
atomic-macros in the same way as in include/atomic.h.
Thus passing a volatile int pointer is fine, too.

Okay to commit?

Bye.
Stefan

ChangeLog:

	* sysdeps/s390/atomic-machine.h:
	(__arch_compare_and_exchange_val_32_acq):
	Cast type to omit volatile qualifier.
	(__arch_compare_and_exchange_val_64_acq): Likewise.
	(atomic_exchange_acq): Likewise.
	* sysdeps/s390/nptl/pthread_spin_init.c: Delete File.
	* sysdeps/s390/nptl/pthread_spin_unlock.c: Likewise.
	* sysdeps/s390/nptl/pthread_spin_lock.c:
	(SPIN_LOCK_READS_BETWEEN_CMPXCHG): New define.
	Use generic spinlock code.
	* sysdeps/s390/nptl/pthread_spin_trylock.c:
	(SPIN_TRYLOCK_USE_CMPXCHG_INSTEAD_OF_XCHG): New define.
	Use generic spinlock code.
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