[jdk11u-dev] RFR: 8261036: Reduce classes loaded by CleanerFactory initialization

[Martin Doerr]

Clean backport of JDK-8261036.

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Commit messages:
 - Backport 992b50087d2ec8878dfcbbd1820a00b6b6bdf644

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/353/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=353&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261036
  Stats: 70 lines in 3 files changed: 35 ins; 19 del; 16 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/353.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/353/head:pull/353

PR: https://git.openjdk.java.net/jdk11u-dev/pull/353