Cleanups made necessary by r348115, or reactions to it:

1. Change size_t to vm_size_t in some places.
2. Rename vm_map_entry_resize_free to drop the _free part.
3. Fix whitespace errors.
4. Fix screwups in patch-conflict-management that left out important

changes related to growing and shrinking objects.

Reviewed by: alc
Approved by: kib (mentor)