Summary:
Start bundling source maps together with the source code itself in the dev mode. Therefore it is no longer required to add a link to the external source map file in dev mode.
In prod mode we still ship them separately.
Reviewed By: mweststrate
Differential Revision: D39775064
fbshipit-source-id: 6c56df7a3fce084c07a8618a63dbd8ae4741348c
982193df48