locking/rwsem: Pass the current atomic count to rwsem_down_read_slowpath()

The atomic count value right after reader count increment can be useful
to determine the rwsem state at trylock time. So the count value is
passed down to rwsem_down_read_slowpath() to be used when appropriate.

Signed-off-by: Waiman Long <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Davidlohr Bueso <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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