Run() is expected to be used after a pause at this point.
Make RunUntilExit() notify using the StartRunning variable entirely.
This is because if we used Run() then the initial thread hasn't yet set
up its core or signal handlers. So it'll ignore SIG63. Then its reason
for pause is still set to Resume.
Once an application tries sending SIG63, we try restoring the context
from a paused state that does exist and crash
Ryan Houdek
22810208b4