Avoid calling vmspace_free() while owning the process lock. Freeing

of an vm space may require obtaining sleepable locks.  Hold the
process to keep the pointer valid, and change trylock to lock, since
there is no longer two process locks owned simultaneously in
vm_pageout_oom().

Note that after the process lock is dropped, process might exec, and
no longer qualify as the owner of biggest vm space.

In collaboration with:	rstone
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

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