perf: don't create holey arrays (#32155)

Don't use `Array` constructor with the size value (ex. `new Array(5)`) - this will create a `HOLEY_ELEMENTS` array (even if this array is filled in later on!);

https://v8.dev/blog/elements-kinds
https://stackoverflow.com/questions/32054170/how-to-resize-an-array

PR Close #32155

modules/benchmarks/src/tree/baseline/tree.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {TreeNode} from '../util';
+import {TreeNode, newArray} from '../util';
 
 export class TreeComponent {
   private _renderNodes: any[];
@@ -25,7 +25,7 @@ export class TreeComponent {
 
   private _create(parentNode: any, dataNode: TreeNode, index: number) {
     if (!this._renderNodes) {
-      this._renderNodes = new Array(dataNode.transitiveChildCount);
+      this._renderNodes = newArray(dataNode.transitiveChildCount);
     }
 
     const span = document.createElement('span');

modules/benchmarks/src/tree/util.ts

@@ -68,3 +68,13 @@ export function flattenTree(node: TreeNode, target: TreeNode[] = []): TreeNode[]
   }
   return target;
 }
+
+export function newArray<T = any>(size: number): T[];
+export function newArray<T>(size: number, value: T): T[];
+export function newArray<T>(size: number, value?: T): T[] {
+  const list: T[] = [];
+  for (let i = 0; i < size; i++) {
+    list.push(value !);
+  }
+  return list;
+}