feat(build): record angular version in the dom (#13164)

modules/@angular/compiler-cli/index.ts

@@ -5,10 +5,14 @@
  * 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
  */
-
 export {AotCompilerHost, AotCompilerHost as StaticReflectorHost, StaticReflector, StaticSymbol} from '@angular/compiler';
 export {CodeGenerator} from './src/codegen';
 export {CompilerHost, CompilerHostContext, NodeCompilerHostContext} from './src/compiler_host';
 export {Extractor} from './src/extractor';
-
 export * from '@angular/tsc-wrapped';
+
+import {Version} from '@angular/core';
+/**
+ * @stable
+ */
+export const VERSION = new Version('0.0.0-PLACEHOLDER');