coroutine: Introduce qemu_coroutine_enter_if_inactive()
In the context of asynchronous work, if we have a worker coroutine that didn't yield, the parent coroutine cannot be reentered because it hasn't yielded yet. In this case we don't even have to reenter the parent because it will see that the work is already done and won't even yield. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NAlberto Garcia <berto@igalia.com>
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