hg: jdk/sandbox: 8242400: Shenandoah: Restore logging to pre-jdk8241984 format

[chris.hegarty at oracle.com]

Changeset: 7992ff451fec
Author:    zgu
Date:      2020-04-09 08:43 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/7992ff451fec

8242400: Shenandoah: Restore logging to pre-jdk8241984 format
Reviewed-by: shade

! src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
! src/hotspot/share/gc/shenandoah/shenandoahUtils.cpp
! src/hotspot/share/gc/shenandoah/shenandoahUtils.hpp