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tu: use os_get_total_physical_memory(..)

Gurchetan Singh requested to merge gurchetansingh/mesa:tu-sysinfo into main 
tu: use os_get_total_physical_memory(..)

This is more OS-agnostic.  On Linux, os_get_total_physical_memory(..)
is based on __SC_PHYS_PAGES, which under the hood seems to call
sysinfo:

https://github.com/bminor/glibc/blob/master/sysdeps/unix/sysv/linux/getsysstats.c#L273

As an optimization, perhaps os_get_total_physical_memory(..)
should use sysinfo directly too.

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