lib: inline Array operations in FreeList methods

Co-authored-by: Antoine du Hamel <[email protected]>

lib/internal/freelist.js

@@ -1,6 +1,7 @@
 'use strict';
 
 const {
+  ObjectSetPrototypeOf,
   ReflectApply,
 } = primordials;
 
@@ -9,18 +10,29 @@ class FreeList {
     this.name = name;
     this.ctor = ctor;
     this.max = max;
-    this.list = [];
+    this.list = ObjectSetPrototypeOf([], null);
   }
 
   alloc() {
-    return this.list.length > 0 ?
-      this.list.pop() :
-      ReflectApply(this.ctor, this, arguments);
+    const { list } = this;
+    const { length } = list;
+
+    if (length > 0) {
+      const lastIndex = length - 1;
+      const result = list[lastIndex];
+      list.length = lastIndex;
+      return result;
+    }
+
+    return ReflectApply(this.ctor, this, arguments);
   }
 
   free(obj) {
-    if (this.list.length < this.max) {
-      this.list.push(obj);
+    const { list } = this;
+    const { length } = list;
+
+    if (length < this.max) {
+      list[length] = obj;
       return true;
     }
     return false;