hg: shenandoah/jdk8u/hotspot: Prettify Shenandoah JDK 8 logging

[shade at redhat.com]

Changeset: a994d7874724
Author:    shade
Date:      2019-04-28 01:42 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/a994d7874724

Prettify Shenandoah JDK 8 logging

! src/share/vm/gc_implementation/shenandoah/shenandoahGCTraceTime.cpp
! src/share/vm/gc_implementation/shenandoah/shenandoahGCTraceTime.hpp
+ src/share/vm/gc_implementation/shenandoah/shenandoahLogging.cpp
! src/share/vm/gc_implementation/shenandoah/shenandoahLogging.hpp