RFR: 8372179: Remove Unused ConcurrentHashTable::MultiGetHandle

[Thomas Schatzl]

Hi all,

  please review the removal of `ConcurrentHashTable::MultiGetHandle` which is never used anywhere but in gtests.

Testing: gha

Thanks,
  Thomas

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Commit messages:
 - * remove whitespace
 - d
 - * remove

Changes: https://git.openjdk.org/jdk/pull/28396/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28396&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372179
  Stats: 37 lines in 3 files changed: 0 ins; 34 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/28396.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28396/head:pull/28396

PR: https://git.openjdk.org/jdk/pull/28396