rcu: Merge __rcu_process_gp_end() into __note_gp_changes()

This commit eliminates some duplicated code by merging
__rcu_process_gp_end() into __note_gp_changes().

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Git-commit: ba9fbe955f026780e6b27c279dba7c86dfdcb7d5
Signed-off-by: Kishan Kumar <kishank@codeaurora.org>