react-native: Module RCTLog is not a registered callable module when set dev mode to false on 0.29.0

I solve this tmp. in index.ios.js, add

var RCTLog = require('RCTLog');

This happens when:

• passing the --dev false option to the packager, which seems to exclude the RCTLog module
• and building/running an app with the Xcode Debug configuration, which (by default) defines the DEBUG macro
• this in turn enables the RCT_DEBUG macro
• which finally leads to RN expecting the RCTLog module to be available

Seeing as all of this happens at compile time and it’s a bit of an edge-case I’m not sure if there’s a simple/good way to detect this in the codebase.

I suggest that, if you do in fact want to test code that is packaged with --dev false, you build your app with the Release configuration instead. From Xcode, hold down the alt key while clicking the run button and select the Release configuration (remember to set it back afterwards).

@ide @javache Any other thoughts?

Reverted: https://github.com/facebook/react-native/commit/4b8688926b93a5b41f191cdba78f0f4335a62111

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