vm_map: add vm_map_find_locked(9)

[alc]

Just out of curiosity, is this a first step in a larger set of changes?

sys/vm/vm_map.c

2145

Drop the "vm_map_find: " prefix?

2259–2265

Hijacking this review for the moment, I want to share an observation: If not for vm_map_alignspace() changing *addr when it fails, a restart would not be necessary here. On entry to vm_map_alignspace(), *addr already holds an address that is large enough and qualifies as ANY_SPACE.

[kib]

In D46678#1064006, @alc wrote:

Just out of curiosity, is this a first step in a larger set of changes?

This is for D46619