Trivial patch for G1PrintRegionLivenessInfo

[Peter Schuller]

I'd like to suggest the attached patch, which generates, at the end of
the region liveness print-out, one line like:

  Overall (among printed): 932052992 used, 441737152 max live, 47.39%.

I haven't signed/sent in the contributor agreement and I didn't file a
bugzilla bug; it seemed like unnecessary overhead (for others, not me)
for trivial stuff like this. Should I?

-- 
/ Peter Schuller
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