Merge branches 'fixes1.2018.07.12b' and 'torture1.2018.07.12b' into HEAD

fixes1.2018.07.12b: Post-gp_seq miscellaneous fixes
torture1.2018.07.12b: Post-gp_seq torture-test updates

diff --cc kernel/rcu/rcu.h
Simple merge

diff --cc kernel/rcu/rcuperf.c
Simple merge

diff --cc kernel/rcu/rcutorture.c
Simple merge

diff --cc kernel/rcu/tree.c
Simple merge