* sysdeps/x86_64/pthreaddef.h: New file.
* sysdeps/i386/pthreaddef.h (gettid): Removed.
* sysdeps/x86_64/pthread_spin_init.c: New file.
* sysdeps/x86_64/pthread_spin_lock.c: New file.
* sysdeps/x86_64/pthread_spin_trylock.c: New file.
* sysdeps/x86_64/pthread_spin_unlock.c: New file.
* sysdeps/i386/i686/pthread_spin_trylock.S (pthread_spin_trylock):
Add missing lock prefix. Minute optimization.
* tst-spin2.c (main): Also check successful trylock call.
* sysdeps/pthread/pthread_sigmask.c (pthread_sigmask): Use correct
syscall. Fix typo in case INTERNAL_SYSCALL is not used.
* sysdeps/i386/pthread_spin_destroy.c: Moved to...
* sysdeps/pthread/pthread_spin_destroy.c: ...here. New file.
* sysdeps/i386/pthread_sigmask.c: Removed. Use the generic code.
* sysdeps/pthread/pthread_sigmask.c (pthread_sigmask): Return correct
value in case of an error. Add support for INTERNAL_SYSCALL.
