git: openjdk/loom: monitor-support: more external preemption support code removal

[duke]

Changeset: 468e696a
Author:    Patricio Chilano Mateo <patricio.chilano.mateo at oracle.com>
Date:      2023-12-01 12:52:25 +0000
URL:       https://git.openjdk.org/loom/commit/468e696ab5793990949e8a9a16ee596bab978c5b

more external preemption support code removal

! src/hotspot/share/classfile/javaClasses.cpp
! src/hotspot/share/classfile/javaClasses.hpp
! src/hotspot/share/runtime/continuation.cpp
! src/hotspot/share/runtime/continuation.hpp
! src/hotspot/share/runtime/continuationFreezeThaw.cpp
! src/hotspot/share/runtime/interfaceSupport.cpp
! src/java.base/share/classes/java/lang/VirtualThread.java