lib: remove let from for loops

This is a known de-opt. It may not be 100% necessary in all cases but it
seems like a decent enough idea to avoid it.

PR-URL: https://github.com/nodejs/node/pull/8873
Reviewed-By: Brian White <mscdex@mscdex.net>
Reviewed-By: Ilkka Myller <ilkka.myller@nodefield.com>
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/v8.js b/lib/v8.js
index 551b2ada98..e78a2480ff 100644
--- a/lib/v8.js
+++ b/lib/v8.js
@@ -60,7 +60,7 @@ exports.getHeapSpaceStatistics = function() {
   const buffer = heapSpaceStatisticsBuffer;
   v8binding.updateHeapSpaceStatisticsArrayBuffer();
 
-  for (let i = 0; i < kNumberOfHeapSpaces; i++) {
+  for (var i = 0; i < kNumberOfHeapSpaces; i++) {
     const propertyOffset = i * kHeapSpaceStatisticsPropertiesCount;
     heapSpaceStatistics[i] = {
       space_name: kHeapSpaces[i],