RFR (S): Total pauses should include update-refs, final-mark pauses

[Aleksey Shipilev]

Hi,

This rehashes the gc+stats data to capture update-refs pauses (that were
completely missing) and final-mark pauses (that were missing start-evac phases):

Fix:
  http://cr.openjdk.java.net/~shade/shenandoah/stats-totalpause/webrev.01/

Output:
  https://paste.fedoraproject.org/paste/XCv5xyO~ilNcINghFCzUGV5M1UNdIGYhyRLivL9gydE=

Thanks,
-Aleksey