[Bug 224532] Remove resident count from procfs map

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224532

            Bug ID: 224532
           Summary: Remove resident count from procfs map
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: glenn.weinberg at intel.com
                CC: emaste at freebsd.org, kib at FreeBSD.org

procfs_map does a very naive resident count, which for huge unbacked virtual
spaces takes essentially forever. Instead of trying to fix this (see bug
188911), the resident count field should be deprecated and always be set to 0.
Linux procfs does not return resident counts.

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