refperf: Label experiment-number column "Runs"

The experiment-number column is currently labeled "Threads", which is
misleading at best.  This commit therefore relabels it as "Runs", and
adjusts the scripts accordingly.

Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

kernel/rcu/refperf.c

@@ -415,7 +415,7 @@ static int main_func(void *arg)
 
 	buf[0] = 0;
 	strcat(buf, "\n");
-	strcat(buf, "Threads\tTime(ns)\n");
+	strcat(buf, "Runs\tTime(ns)\n");
 
 	for (exp = 0; exp < nruns; exp++) {
 		if (errexit)

tools/testing/selftests/rcutorture/bin/kvm-recheck-refperf.sh

@@ -24,7 +24,7 @@ configfile=`echo $i | sed -e 's/^.*\///'`
 
 sed -e 's/^\[[^]]*]//' < $i/console.log | tr -d '\015' |
 awk -v configfile="$configfile" '
-/^[ 	]*Threads	Time\(ns\) *$/ {
+/^[ 	]*Runs	Time\(ns\) *$/ {
 	if (dataphase + 0 == 0) {
 		dataphase = 1;
 		# print configfile, $0;