Mark mmap(2), munmap(2) and mprotect(2) as NOLOCK.

Mark mmap(2), munmap(2) and mprotect(2) as NOLOCK.

Accesses to data structures used by these syscalls are serialized by the
VM map lock with the exception of file mappings which are still protected
by the KERNEL_LOCK().

Unlocking this set of syscalls improves most of userland workloads.

Tested by many including robert@ (since 2 years), mlarkin@, kn@, sdk@,
jca@, aoyama@, naddy@, Scott Bennett and others. Thanks to all!

Joint work with kn@.

ok robert@, aja@, kettenis@, kn@, deraadt@, beck@