[Bug 199151] speed up pagezero assembly on Xeon

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199151

            Bug ID: 199151
           Summary: speed up pagezero assembly on Xeon
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: lidl at pix.net

Created attachment 155167
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=155167&action=edit
diff to sys/amd64/amd64/support.S - pagezero function

The attached patch gives a consistant 1% decrease in system time when
doing something that forks a bunch of jobs, like buildworld or buildkernel,
when running with modestly high -j values (-j 24 or -j 32).

We have been running this in production for a couple of months.

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