fix(@angular-devkit/build-angular): use GLOBAL_DEFS_FOR_TERSER_WITH_A…

…OT if present

Fix #15206

packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/common.ts

@@ -308,6 +308,23 @@ export function getCommonConfig(wco: WebpackConfigOptions): Configuration {
       // Do nothing, the default above will be used instead.
     }
 
+    if (buildOptions.aot) {
+      // Also try to load AOT-only global definitions.
+      try {
+        // tslint:disable-next-line:no-implicit-dependencies
+        const GLOBAL_DEFS_FOR_TERSER_WITH_AOT =
+          require('@angular/compiler-cli').GLOBAL_DEFS_FOR_TERSER_WITH_AOT;
+        if (GLOBAL_DEFS_FOR_TERSER_WITH_AOT) {
+          angularGlobalDefinitions = {
+            ...angularGlobalDefinitions,
+            ...GLOBAL_DEFS_FOR_TERSER_WITH_AOT,
+          };
+        }
+      } catch {
+        // Do nothing.
+      }
+    }
+
     const terserOptions = {
       ecma: wco.supportES2015 ? 6 : 5,
       warnings: !!buildOptions.verbose,