Summary:
I *think* this is causing a crash for me in a release build (curiously, not a debug build):
```
ReferenceError: Can't find variable: self
```
I saw this in 0.18.1, which I assume was renamed to v0.19.0-rc.
Closes https://github.com/facebook/react-native/pull/5562
Reviewed By: svcscm
Differential Revision: D2866491
Pulled By: androidtrunkagent
fb-gh-sync-id: 196f718bf807c5eef676f66f1e15d7bde9475d5b