memorder: Add example showing RCU readers insensitive to ordering

Like lock-based critical sections in programs synchronizing solely with
locking, RCU is (roughly speaking) insensitive to the order of accesses
within its read-side critical sections.  This commit therefore adds an
example illustrating this point.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
2 files changed