refactor(compiler): remove unused code (angular#61668)

Removes the following unused code from the compiler:
* The ICU expander appears to be some really old code converting ICUs into legacy-style control flow directives. It's annoying to keep this one since we need to update it any time the AST changes.
* The `PipeCollector` class wasn't used anywhere.
* The `partitionArray` function wasn't used anywhere.
* The `newArray` function was used only in one test and it can be easily replaced with `new Array().fill`.

PR Close angular#61668

Author: crisbeto

packages/compiler/src/ml_parser/icu_ast_expander.ts

@@ -26,7 +26,6 @@ import {
   ParsedVariable,
   ParserError,
   PropertyRead,
-  RecursiveAstVisitor,
   TemplateBinding,
   ThisReceiver,
   VariableBinding,
@@ -838,16 +837,6 @@ export class BindingParser {
   }
 }
 
-export class PipeCollector extends RecursiveAstVisitor {
-  pipes = new Map<string, BindingPipe>();
-  override visitPipe(ast: BindingPipe, context: any): any {
-    this.pipes.set(ast.name, ast);
-    ast.exp.visit(this);
-    this.visitAll(ast.args, context);
-    return null;
-  }
-}
-
 function isAnimationLabel(name: string): boolean {
   return name[0] == '@';
 }

packages/compiler/src/template_parser/binding_parser.ts

@@ -138,36 +138,6 @@ export interface Console {
 const _global: {[name: string]: any} = globalThis;
 export {_global as global};
 
-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;
-}
-
-/**
- * Partitions a given array into 2 arrays, based on a boolean value returned by the condition
- * function.
- *
- * @param arr Input array that should be partitioned
- * @param conditionFn Condition function that is called for each item in a given array and returns a
- * boolean value.
- */
-export function partitionArray<T, F = T>(
-  arr: (T | F)[],
-  conditionFn: (value: T | F) => boolean,
-): [T[], F[]] {
-  const truthy: T[] = [];
-  const falsy: F[] = [];
-  for (const item of arr) {
-    (conditionFn(item) ? truthy : falsy).push(item as any);
-  }
-  return [truthy, falsy];
-}
-
 const V1_TO_18 = /^([1-9]|1[0-8])\./;
 
 export function getJitStandaloneDefaultForVersion(version: string): boolean {