bhyve: terminate waiting loops if thread suspension is requested.

PR: 242724
Reviewed by: markj
Reported and tested by: Aleksandr Fedorov <aleksandr.fedorov@itglobal.com>

	 (previous version)

Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D22881