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Move syscall_thread_{enter,exit}() into the slow path. This is only

Description

Move syscall_thread_{enter,exit}() into the slow path. This is only
needed for syscalls from unloadable modules.

Reviewed by: kib
MFC after: 2 weeks
Sponsored by: EPSRC
Differential Revision: https://reviews.freebsd.org/D26988

Details