hg: jdk/submit: 8247860: Shenandoah: add update watermark line in rich assert failure message

[shade at redhat.com]

Changeset: 08211be640e9
Author:    shade
Date:      2020-06-18 19:14 +0200
URL:       https://hg.openjdk.java.net/jdk/submit/rev/08211be640e9

8247860: Shenandoah: add update watermark line in rich assert failure message
Reviewed-by: rkennke

! src/hotspot/share/gc/shenandoah/shenandoahAsserts.cpp