RFR: 8213415: BitMap::word_index_round_up overflow problems

[Kim Barrett]

> On Jun 10, 2019, at 9:14 PM, Kim Barrett <kim.barrett at oracle.com> wrote:
> new webrevs:
> full: http://cr.openjdk.java.net/~kbarrett/8213415/open.01/
> incr: http://cr.openjdk.java.net/~kbarrett/8213415/open.01.inc/

Stefan and I have been talking about this offline.  We have some ideas for further changes in
a slightly different direction, so no point in anyone else reviewing the open.01 changes right now
(or maybe ever).