feat(ivy): produce Renderer2 back-patching and factories. (#22506)

Produces back-patch as described in the #22235 and referenced in #22480.

This just contains the compiler implementations and the corresponding unit
tests. Connecting the dots as described in #22480 will be in a follow on
change.

PR Close #22506

packages/compiler/src/render3/r3_module_factory_compiler.ts

@@ -0,0 +1,46 @@
+/**
+ * @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 {StaticReflector} from '../aot/static_reflector';
+import {CompileDirectiveMetadata, CompileIdentifierMetadata, CompileNgModuleMetadata, CompilePipeSummary, CompileTypeMetadata, identifierName} from '../compile_metadata';
+import {CompileMetadataResolver} from '../metadata_resolver';
+import * as o from '../output/output_ast';
+import {OutputContext} from '../util';
+
+import {Identifiers as R3} from './r3_identifiers';
+
+/**
+ * Write a Renderer2 compatibility module factory to the output context.
+ */
+export function compileModuleFactory(
+    outputCtx: OutputContext, module: CompileNgModuleMetadata,
+    backPatchReferenceOf: (module: CompileTypeMetadata) => o.Expression,
+    resolver: CompileMetadataResolver) {
+  const ngModuleFactoryVar = `${identifierName(module.type)}NgFactory`;
+
+  const parentInjector = 'parentInjector';
+  const createFunction = o.fn(
+      [new o.FnParam(parentInjector, o.DYNAMIC_TYPE)],
+      [new o.IfStmt(
+          o.THIS_EXPR.prop(R3.PATCH_DEPS).notIdentical(o.literal(true, o.INFERRED_TYPE)),
+          [
+            o.THIS_EXPR.prop(R3.PATCH_DEPS).set(o.literal(true, o.INFERRED_TYPE)).toStmt(),
+            backPatchReferenceOf(module.type).callFn([]).toStmt()
+          ])],
+      o.INFERRED_TYPE, null, `${ngModuleFactoryVar}_Create`);
+
+  const moduleFactoryLiteral = o.literalMap([
+    {key: 'moduleType', value: outputCtx.importExpr(module.type.reference), quoted: false},
+    {key: 'create', value: createFunction, quoted: false}
+  ]);
+
+  outputCtx.statements.push(
+      o.variable(ngModuleFactoryVar).set(moduleFactoryLiteral).toDeclStmt(o.DYNAMIC_TYPE, [
+        o.StmtModifier.Exported, o.StmtModifier.Final
+      ]));
+}