locking/spinlocks/mcs: Rename optimistic_spin_queue() to optimistic_spin_node()

Currently, the per-cpu nodes structure for the cancellable MCS spinlock is
named "optimistic_spin_queue". However, in a follow up patch in the series
we will be introducing a new structure that serves as the new "handle" for
the lock. It would make more sense if that structure is named
"optimistic_spin_queue". Additionally, since the current use of the
"optimistic_spin_queue" structure are  "nodes", it might be better if we
rename them to "node" anyway.

This preparatory patch renames all current "optimistic_spin_queue"
to "optimistic_spin_node".

Signed-off-by: Jason Low <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Cc: Scott Norton <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Waiman Long <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Tim Chen <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Aswin Chandramouleeswaran <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Josef Bacik <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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