Rewrite pg_size_pretty() to avoid compiler bug.

Convert it to use successive shifts right instead of increasing a divisor.
This is probably a tad more efficient than the original coding, and it's
nicer-looking than the previous patch because we don't need a special case
to avoid overflow in the last branch.  But the real reason to do it is to
avoid a Solaris compiler bug, as per results from buildfarm member moa.

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