[PATCH][s390,ppc] Use FUTEX_WAIT_BITSET for *timedwait

[Siddhesh Poyarekar]

Hi,

Here's the second patch that implements
pthread_rwlock_timed*lock and lll_robust_timedlock_wait using
FUTEX_WAIT_BITSET if available.  It needs the earlier FUTEX_WAIT_BITSET
patch to work correctly.  I have also committed this patch to the
siddhesh/wait_bitset branch (and learned that rebases are only good
when you're working locally).

This is again tested on s390 and ppc.  If both patches are OK, I will
fold all of them into a single commit if that is fine (with a single
ChangeLog of course).


Regards,
Siddhesh

nptl/ChangeLog:

	* pthread_rwlock_timedrdlock.c (pthread_rwlock_timedrdlock):
	Time out if absolute timeout is negative.
	[__ASSUME_FUTEX_CLOCK_REALTIME &&
	lll_futex_timed_wait_bitset]: Use lll_futex_timed_wait_bitset.
	* pthread_rwlock_timedwrlock.c (pthread_rwlock_timedwrlock):
	Likewise.
	* sysdeps/unix/sysv/linux/lowlevelrobustlock.c
	(__lll_robust_timedlock_wait): Likewise.
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