Next batch of LKMM patches

[Paul E. McKenney]

Hello!

The following set of LKMM patches in -rcu look to me to be ready to
send off.  If you disagree, please do let me know so that we can fix
whatever problems that there might be.  If I do not hear otherwise,
I will send them off this coming Friday.

							Thanx, Paul

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5bb25a486ccb "memory-barriers: More text to de-emphasize smp_read_barrier_depends()"
b59fd89b465f "tools/memory-model: Remove mention of docker/gentoo image"
d5e6bc0a0ed4 "tools/memory-order: Add documentation of new litmus test
3eab67f3c41b "tools/memory-model: Update: Remove rb-dep, smp_read_barrier_depends, and lockless_dereference"