tools/memory-model: Make judgelitmus.sh note timeouts

Currently, judgelitmus.sh treats timeouts (as in the "--timeout" argument)
as "!!! Verification error".  This can be misleading because it is quite
possible that running the test longer would have produced a verification.
This commit therefore changes judgelitmus.sh to check for timeouts and
to report them with "!!! Timeout".
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

tools/memory-model/scripts/judgelitmus.sh

@@ -42,6 +42,14 @@ grep '^Observation' $LKMM_DESTDIR/$litmus.out
 if grep -q '^Observation' $LKMM_DESTDIR/$litmus.out
 then
 	:
+elif grep '^Command exited with non-zero status 124' $LKMM_DESTDIR/$litmus.out
+then
+	echo ' !!! Timeout' $litmus
+	if ! grep -q '!!!' $LKMM_DESTDIR/$litmus.out
+	then
+		echo ' !!! Timeout' >> $LKMM_DESTDIR/$litmus.out 2>&1
+	fi
+	exit 124
 else
 	echo ' !!! Verification error' $litmus
 	if ! grep -q '!!!' $LKMM_DESTDIR/$litmus.out