refactor(core): Use Nullish coalescing assignment for view getters. (a…

…ngular#56242)

Micro optim, this wasn't minified by the optimizer.

PR Close angular#56242

packages/core/src/render3/instructions/shared.ts

@@ -1956,11 +1956,11 @@ export function storePropertyBindingMetadata(
 
 export function getOrCreateLViewCleanup(view: LView): any[] {
   // top level variables should not be exported for performance reasons (PERF_NOTES.md)
-  return view[CLEANUP] || (view[CLEANUP] = []);
+  return (view[CLEANUP] ??= []);
 }
 
 export function getOrCreateTViewCleanup(tView: TView): any[] {
-  return tView.cleanup || (tView.cleanup = []);
+  return (tView.cleanup ??= []);
 }
 
 /**