arm64 pmap: batch chunk removal in pmap_remove_pages

[andrew]

Summary

As with amd64 batch chunk removal in pmap_remove_pages to move it out
of the pv list lock. This is one of the main contested locks when
running poudriere on a 160 core Ampere Altra server.

[markj]

sys/arm64/arm64/pmap.c

2755

Missing newline.

5419

Do pv chunks need to be freed under the pmap lock?

[andrew]

sys/arm64/arm64/pmap.c

5419

It's the same as amd64. If the comments in D21832 don't apply here I can move it.

[alc]

sys/arm64/arm64/pmap.c

5419

No, don't move it. The same reason applies here.

[andrew]

Add a missing newline