We have not synced up sh/jdk for a while now. Let's pick up to the latest upstream tag, jdk-13+17.
Merge is trivial.
Changesets:
http://cr.openjdk.java.net/~shade/shenandoah/merges/jdk-13%2b17/changesets.txt
Testing: hotspot_gc_shenandoah {fastdebug, release}
--
Thanks,
-Aleksey