* sysdeps/i386/tls.h (THREAD_GETMEM_NC): Change interface. It now
takes the array member name and the index as parameters.
(THREAD_SETMEM_NC): Likewise.
* pthread_getspecific.c: Use new THREAD_GETMEM_NC interface.
* pthread_setspecific.c: Use new THREAD_GETMEM_NC and THREAD_SETMEM_NC
interfaces.
* sysdeps/i386/tls.h (THREAD_SETMEM): Use size of member element
to decide which code to use.
(THREAD_SETMEM_NC): Likewise.