Summary:
When a synchronous call from JS to native code throws an error, it doesn't include a useful stack trace from the native side. To improve error attribution, this diff pops the frames in `MessageQueue.js` and `NativeModules.js` from the stack traces of such errors. This uses the `error.framesToPop` convention understood by RN's global error handler.
For now we limit this to errors converted from C++ exceptions in host functions, since those are not likely to ever contain further JavaScript frames at the point where we catch them; if they did, it would violate our assumption that the top two frames of the stack are in the JS bridge code.
Reviewed By: cwdick
Differential Revision: D15805054
fbshipit-source-id: 8c1dd7c81b00b6a88e31473271889af1f88f7263