git: openjdk/jdk8u-dev: 8071507: (ref) Clear phantom reference as soft and weak references do

[Poonam Bajaj]

Changeset: 0869fc01
Author:    Poonam Bajaj <poonam at openjdk.org>
Date:      2022-08-11 13:56:53 +0000
URL:       https://git.openjdk.org/jdk8u-dev/commit/0869fc0153bde09c41ad37c3c46f715e23b41966

8071507: (ref) Clear phantom reference as soft and weak references do
8143847: Remove REF_CLEANER reference category

Reviewed-by: iris, dholmes, mchung, andrew
Backport-of: ad6cdea5ae385623afa86251a8278c9c5274f4c1

! hotspot/src/share/vm/classfile/systemDictionary.cpp
! hotspot/src/share/vm/classfile/systemDictionary.hpp
! hotspot/src/share/vm/classfile/vmSymbols.hpp
! hotspot/src/share/vm/memory/referenceProcessor.cpp
! hotspot/src/share/vm/memory/referenceProcessor.hpp
! hotspot/src/share/vm/memory/referenceType.hpp
! hotspot/src/share/vm/runtime/vmStructs.cpp
! jdk/src/share/classes/java/lang/ref/PhantomReference.java
! jdk/src/share/classes/java/lang/ref/package.html
+ jdk/test/java/lang/ref/PhantomReferentClearing.java