hg: shenandoah/jdk: Revert "Print special cause for Metadata GC"

[shade at redhat.com]

Changeset: 65831adfda73
Author:    shade
Date:      2018-11-04 20:36 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/65831adfda73

Revert "Print special cause for Metadata GC"

! src/hotspot/share/gc/shenandoah/shenandoahControlThread.cpp
! src/hotspot/share/gc/shenandoah/shenandoahHeuristics.cpp