util: fix permanent deoptimizations

PR-URL: https://github.com/nodejs/node/pull/12456
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/internal/util.js

@@ -162,7 +162,7 @@ function getSignalsToNamesMapping() {
     return signalsToNamesMapping;
 
   signalsToNamesMapping = Object.create(null);
-  for (const key in signals) {
+  for (var key in signals) {
     signalsToNamesMapping[signals[key]] = key;
   }
 

lib/util.js

@@ -669,7 +669,7 @@ function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
     }
     visibleLength++;
   }
-  const remaining = value.length - index;
+  var remaining = value.length - index;
   if (remaining > 0) {
     output.push(`... ${remaining} more item${remaining > 1 ? 's' : ''}`);
   }