RFC/RFR: Pick up jdk-11.0.3+1 to sh/jdk11

[Aleksey Shipilev]

Upstream^W We have pushed the jdk-11.0.3+1 tag upstream to jdk-updates/jdk11u. Let's pick it up to
sh/jdk11 to stabilize before the CPU. We would probably have other minor merges with +2, +3, etc.

Summary of changes:
 http://cr.openjdk.java.net/~shade/shenandoah/merge-jdk11.0.3-1/changesets.txt

Webrev:
 http://cr.openjdk.java.net/~shade/shenandoah/merge-jdk11.0.3-1/webrev.01/

The plan is to push this merge, run it through nightlies and then tag it shenandoah-jdk-11.0.3+1.

Testing: hotspot_gc_shenandoah {fastdebug,release}

Thanks,
-Aleksey