Heads-up: Lucene/Solr bug in loop predicates

[Aleksey Shipilev]

(Doesn't that sound familiar)

Hey Roland,

Seems to happen within minutes, and the bug is triggered by the test runner, not the test itself. It
happens only on Shenandoah forest (tested with shendandoah/jdk10), and not the upstream (jdk10/hs).
Although it might be because we miss some fix in last two weeks.

See crash logs here:
 http://cr.openjdk.java.net/~shade/shenandoah/fail-lucene/

Steps to reproduce:

$ git clone git://git.apache.org/lucene-solr
$ cd lucene-solr
$ ant test -Dtestcase=duuuh

Thanks,
-Aleksey