Merge branch '1206-tcp-high-water-stats-fix-type' into 'master'

Avoid an extra atomic_load call when doing atomic_compare_exchange_loop

See merge request !2531

lib/isc/stats.c

@@ -157,15 +157,12 @@ void isc_stats_update_if_greater(isc_stats_t *stats,
 	REQUIRE(ISC_STATS_VALID(stats));
 	REQUIRE(counter < stats->ncounters);
 
-	isc_statscounter_t curr_value;
-
+	isc_statscounter_t curr_value =
+		atomic_load_relaxed(&stats->counters[counter]);
 	do {
-		curr_value = atomic_load_explicit(&stats->counters[counter],
-						  memory_order_relaxed);
 		if (curr_value >= value) {
 			break;
 		}
-
 	} while (!atomic_compare_exchange_strong(&stats->counters[counter],
 						 &curr_value,
 						 value));