RFR: 8361693: Remove Klass::clean_subklass_tree()

[Thomas Schatzl]

Hi all,

  please review this inlining of Klass::clean_subklass_tree because it's only used in one place and replaces only one call. There does not seem to be any advantage having the extra method.

Testing: local compilation, gha

Thanks,
  Thomas

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Commit messages:
 - 8361693

Changes: https://git.openjdk.org/jdk/pull/26220/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26220&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361693
  Stats: 4 lines in 2 files changed: 0 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26220.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26220/head:pull/26220

PR: https://git.openjdk.org/jdk/pull/26220