Polyfill failing on UWP Edge Mobile when including polyfill script on index.html

**I'm submitting a bug report**

* **Library Version:**
1.3.3

**Please tell us about your environment:**
* **Operating System:**
Windows 10

* **Node Version:**
8.5.X

* **NPM Version:**
3.8.9

* **JSPM OR Webpack AND Version**
Webpack 3.12.0

* **Browser:**
Edge Mobile 44.X from UWP

* **Language:**
javascript

**Current behavior:**
Webpage does not load on any page because edge is failing on index.html when we call
```

```
In which the polyfill.js fails giving this error:


**Expected/desired behavior:**

* **What is the expected behavior?**
Any page of the website should load

* **What is the motivation / use case for changing the behavior?**
possible browser not supported ?

Reproduce the failure in UWP Edge Mobile 44.X using the script tags shown for index.html and the dist/vendor-bundle.js and dist/polyfill-bundle.js files. Inspect the polyfill.js failure shown in the attached screenshot and compare the behavior with the reported JavaScript, Node, npm, and Webpack versions. Done means the website page loads in the reported environment.

Written by the indexing model from the issue text.