[jdk21u-dev] RFR: 8315998: Remove dead ClassLoaderDataGraphKlassIteratorStatic

[Goetz Lindenmaier]

I backport this for parity with 21.0.4-oracle.

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Commit messages:
 - Backport 347beb21aa856cebdcf4407eac59f1cad46376c1

Changes: https://git.openjdk.org/jdk21u-dev/pull/427/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=427&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315998
  Stats: 95 lines in 5 files changed: 0 ins; 95 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/427.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/427/head:pull/427

PR: https://git.openjdk.org/jdk21u-dev/pull/427