hg: shenandoah/jdk8/hotspot: Revert obsolete shared-code changes in runtime synchronizer code

[rkennke at redhat.com]

Changeset: bd480a95ed11
Author:    rkennke
Date:      2019-11-12 22:22 +0100
URL:       https://hg.openjdk.java.net/shenandoah/jdk8/hotspot/rev/bd480a95ed11

Revert obsolete shared-code changes in runtime synchronizer code

! src/share/vm/runtime/biasedLocking.cpp
! src/share/vm/runtime/synchronizer.cpp