fixup: address comment

Author: BridgeAR

lib/internal/modules/cjs/loader.js

@@ -88,7 +88,6 @@ let requireDepth = 0;
 let statCache = new Map();
 function stat(filename) {
   filename = path.toNamespacedPath(filename);
-  if (statCache === null) statCache = new Map();
   let result = statCache.get(filename);
   if (result !== undefined) return result;
   result = internalModuleStat(filename);
@@ -800,6 +799,7 @@ Module.prototype._compile = function(content, filename) {
   var exports = this.exports;
   var thisValue = exports;
   var module = this;
+  if (statCache === null) statCache = new Map();
   if (inspectorWrapper) {
     result = inspectorWrapper(compiledWrapper, thisValue, exports,
                               require, module, filename, dirname);