fix(@angular-devkit/build-angular): ensure generator polyfills are present for ES5

Author: clydin

packages/angular_devkit/build_angular/package.json

@@ -40,6 +40,7 @@
     "postcss-import": "12.0.1",
     "postcss-loader": "3.0.0",
     "raw-loader": "3.1.0",
+    "regenerator-runtime": "0.13.3",
     "rxjs": "6.4.0",
     "sass": "1.22.10",
     "sass-loader": "7.3.1",

packages/angular_devkit/build_angular/src/angular-cli-files/models/es5-polyfills.js

@@ -7,10 +7,7 @@
  */
 
 // ES2015 symbol capabilities
-import 'core-js/modules/es.symbol';
-import 'core-js/modules/es.symbol.description';
-import 'core-js/modules/es.symbol.iterator';
-import 'core-js/modules/es.symbol.to-string-tag';
+import 'core-js/es/symbol';
 
 // ES2015 function capabilities
 import 'core-js/modules/es.function.bind';
@@ -103,3 +100,5 @@ import 'core-js/modules/web.dom-collections.for-each';
 import 'core-js/modules/web.dom-collections.iterator';
 import 'core-js/modules/es.promise';
 import 'core-js/modules/es.json.to-string-tag';
+
+import 'regenerator-runtime/runtime';

yarn.lock

@@ -9646,6 +9646,11 @@ regenerate@^1.2.1, regenerate@^1.4.0:
   resolved "https://registry.yarnpkg.com/regenerate/-/regenerate-1.4.0.tgz#4a856ec4b56e4077c557589cae85e7a4c8869a11"
   integrity sha512-1G6jJVDWrt0rK99kBjvEtziZNCICAuvIPkSiUFIQxVP06RCVpq3dmDo2oi6ABpYaDYaTRr67BEhL8r1wgEZZKg==
 
+regenerator-runtime@0.13.3:
+  version "0.13.3"
+  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.13.3.tgz#7cf6a77d8f5c6f60eb73c5fc1955b2ceb01e6bf5"
+  integrity sha512-naKIZz2GQ8JWh///G7L3X6LaQUAMp2lvb1rvwwsURe/VXwD6VMfr+/1NuNw3ag8v2kY1aQ/go5SNn79O9JU7yw==
+
 regenerator-runtime@^0.11.0:
   version "0.11.1"
   resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz#be05ad7f9bf7d22e056f9726cee5017fbf19e2e9"