I have this issue too. AMD Athlon 64 X2 4400+.
After spending hours trying to fix this boot problem (didn't know it was caused by this KB4056892 update...) I decided to install Windows from scratch.
I've got a little "angry" when it got stuck at boot screen again after finish installing all updates.
But after rebooting 2 times, Windows was able to successfully rollback the update.
I then find out the problem was caused by the lastest cumulative update.
So I uninstalled it and run the wushowhide.diagcab to hide it.
And I paused Windows Update for 35 days just to give MS a chance to fix the issue in the meanwhile.
But I'm not keeping my hopes too high...