[jdk21u-dev] RFR: 8332340: Add JavacBench as a test case for CDS

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

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Commit messages:
 - Backport 7fd9d6c760c66d3e2f4034cf1a6b1b583ff829a9

Changes: https://git.openjdk.org/jdk21u-dev/pull/970/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=970&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332340
  Stats: 607 lines in 4 files changed: 607 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/970.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/970/head:pull/970

PR: https://git.openjdk.org/jdk21u-dev/pull/970