We’ve added support for bitcode in the latest release of the iOS Google Mobile Ads SDK ! The Enable Bitcode 
You can change this setting for your app in the project’s Build Settings . Under the Build Options  section, set Enable Bitcode  to Yes. Note that if you enable bitcode, all apps and frameworks in the app bundle
need to include bitcode as well.
With the new release, we’ve also made some additional changes , one of which is an added dependency for the MediaPlayer framework . You will need to link this framework to your app’s binary. If you are using
CocoaPods, then running a simple pod update will do the trick.
If you have any questions regarding the new iOS SDK release, feel free to
contact us through our forum .
Tristan Emrich , Mobile Ads Developer Relations