Correctly measure system load averages > 1024

Correctly measure system load averages > 1024

The old fixed-point arithmetic used for calculating load averages had an
overflow at 1024.  So on systems with extremely high load, the observed
load average would actually fall back to 0 and shoot up again, creating
a kind of sawtooth graph.

Fix this by using 64-bit math internally, while still reporting the load
average to userspace as a 32-bit number.

Sponsored by:	Axcient
Reviewed by:	imp
Differential Revision: https://reviews.freebsd.org/D35134