hg: shenandoah/jdk8/hotspot: Cherry-pick JDK-8231201: hs_err should print coalesced safepoint operations in Events section

[shade at redhat.com]

Changeset: aedd635caddf
Author:    shade
Date:      2019-09-19 09:50 +0200
URL:       https://hg.openjdk.java.net/shenandoah/jdk8/hotspot/rev/aedd635caddf

Cherry-pick JDK-8231201: hs_err should print coalesced safepoint operations in Events section

! src/share/vm/runtime/vmThread.cpp