I have been getting a warning when trying to validate my App (or upload it) that "The resulting API analysis file is too large. We were unable to validate your API usage prior to delivery". I just noticed this warning after enabling bitcode while uploading or validating the App. I thought it might be helpful for other people to know that you may still be able to get your API validated by choosing to do a "Validate" and turning bitcode off before actualy Uploading (with bitcode on). You'll still get the warning on the Upload but at least you'll have some confidence that your API usage was checked.
Cheers