fix(ivy): add @nocollapse when writing closure-annotated code (#25775)

Closure requires @nocollapse on Ivy definition static fields in order
to not convert them to standalone constants. However tsickle, the tool
which would ordinarily be responsible for adding @nocollapse, doesn't
properly annotate fields which are added synthetically via transforms.
So this commit adds @nocollapse by applying regular expressions against
code during the final write to disk.

PR Close #25775

packages/compiler-cli/test/transformers/nocollapse_hack_spec.ts

@@ -0,0 +1,26 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {nocollapseHack} from '../../src/transformers/nocollapse_hack';
+
+describe('@nocollapse hack', () => {
+  it('should add @nocollapse to a basic class', () => {
+    const decl = `Foo.ngInjectorDef = define(...);`;
+    expect(nocollapseHack(decl)).toEqual('/** @nocollapse */ ' + decl);
+  });
+
+  it('should add nocollapse to an if (false) declaration of the kind generated by tsickle', () => {
+    const decl = `
+      if (false) {
+        /** @type {?} */
+        Foo.ngInjectorDef;
+      }
+    `;
+    expect(nocollapseHack(decl)).toContain('/** @nocollapse @type {?} */');
+  });
+});