RFR: 8316002: Remove unnecessary seen_dead_loader in ClassLoaderDataGraph::do_unloading

[Thomas Schatzl]

Hi all,

  please review this removal of an unnecessary local variable which value can be derived at the end by existing ones.

Testing: gha

Thanks,
  Thomas

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Commit messages:
 - 8316002-remove-seen-dead-loaders

Changes: https://git.openjdk.org/jdk/pull/15662/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15662&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316002
  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15662.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15662/head:pull/15662

PR: https://git.openjdk.org/jdk/pull/15662