Most applications call AcquireRight before calling RegisterInterruptRelayQueue so we can't assign the thread id there.
This fixes the bug with LLE applets not launching properly.
This is true for all interrupts except PDC0 and PDC1, which should be triggered for all registered threads.
TODO: The real GSP module seems to only trigger PDC0 after updating the screens (both top and bottom). PDC1 doesn't seem to be triggered at all.
The registered interrupt event is unique to each session that calls RegisterInterruptRelayQueue, and only that event should be reset when UnregisterInterruptRelayQueue is called.
In a future commit, the count of cached pages will be reintroduced in
the actual surface cache. Also adds an Invalidate only to the cache
which marks a region as invalid in order to try to avoid a costly flush
from 3ds memory
The only functional change is the error handling of GSP_GPU::ReadHWRegs function. We previously didn't return error codes (not even for success). The new returns were found by reverse engineering the GSP module.
