postinit_devices() may cause additional devices to be registered
(e.g. PCI hosts will register their cards). We were not calling
device_postinit on those devices, because the iterator over the
device map was set up at the start of the loop.
Keep looping until we've actually initialized all devices in the map.
Result of running IWYU (https://include-what-you-use.org/) and
applying most of the suggestions about unncessary includes and
forward declarations.
Was motivated by observing that <thread> was being included in
ppcopcodes.cpp even though it was unused (found while researching
the use of threads), but seems generally good to help with build
times and correctness.
