Remove RCTLog from prod builds

Reviewed By: javache

Differential Revision: D3437532

fbshipit-source-id: 973491fe74614d381a173a067fb2dd376e14a36a

Libraries/JavaScriptAppEngine/Initialization/InitializeJavaScriptAppEngine.js

@@ -50,7 +50,9 @@ function setUpConsole() {
   const ExceptionsManager = require('ExceptionsManager');
   ExceptionsManager.installConsoleErrorReporter();
 
-  require('RCTLog');
+  if (__DEV__) {
+    require('RCTLog');
+  }
 }
 
 /**