[jdk25] RFR: 8362572: Delete the usage of "sun.java2d.reftype" from the sun.java2d.Disposer

[Rui Li]

A clean backport of https://bugs.openjdk.org/browse/JDK-8362572.

Testing in progress. The change is quite straightforward and has been in tip for over a month. Should be safe.

-------------

Commit messages:
 - Backport 7d7d308d9ab6f06ebdab0f5967a5bfc007d4217f

Changes: https://git.openjdk.org/jdk/pull/26975/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26975&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362572
  Stats: 27 lines in 1 file changed: 2 ins; 21 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/26975.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26975/head:pull/26975

PR: https://git.openjdk.org/jdk/pull/26975