Simplify references to the global object

Take advantage of sloppy mode, aka non-strict mode, where unbound
functions are called with the global object as `this`.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode#Securing_JavaScript

packages/regenerator-runtime/runtime-module.js

@@ -1,9 +1,6 @@
 // This method of obtaining a reference to the global object needs to be
 // kept identical to the way it is obtained in runtime.js
-var g =
-  typeof global === "object" ? global :
-  typeof window === "object" ? window :
-  typeof self === "object" ? self : this;
+var g = (function() { return this })() || Function("return this")();
 
 // Use `getOwnPropertyNames` because not all browsers support calling
 // `hasOwnProperty` on the global `self` object in a worker. See #183.

packages/regenerator-runtime/runtime.js

@@ -727,10 +727,8 @@
     }
   };
 })(
-  // Among the various tricks for obtaining a reference to the global
-  // object, this seems to be the most reliable technique that does not
-  // use indirect eval (which violates Content Security Policy).
-  typeof global === "object" ? global :
-  typeof window === "object" ? window :
-  typeof self === "object" ? self : this
+  // In sloppy mode, unbound `this` refers to the global object, fallback to
+  // Function constructor if we're in global strict mode. That is sadly a form
+  // of indirect eval which violates Content Security Policy.
+  (function() { return this })() || Function("return this")()
 );