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Summary: **Motivation** detailed in #12702. **Test plan** 1) running [a piece of code](https://github.com/mobxjs/mobx/issues/839#issuecomment-284153126) that utilizes the helper without any modifications on the react native package results an error being thrown.  2) updating the list of helpers available by adding the definition of `defineEnumerableProperties` as provided by babel [babel/babel/packages/babel-helpers/src/helpers.js](https://github.com/babel/babel/blob/master/packages/babel-helpers/src/helpers.js#L275-L285) results no errors.  Closes https://github.com/facebook/react-native/pull/12703 Differential Revision: D4658120 Pulled By: ericvicenti fbshipit-source-id: 914aed4d313b3cc4f7ab99049d05d0aef269a3be