RFR: 8340864: Remove unused lines related to vmClasses

[Ioi Lam]

Trivial fix -- remove some lines that are no longer used.

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Commit messages:
 - 8340864: Remove unused lines related to vmClasses

Changes: https://git.openjdk.org/jdk/pull/21173/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21173&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340864
  Stats: 20 lines in 3 files changed: 0 ins; 19 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21173.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21173/head:pull/21173

PR: https://git.openjdk.org/jdk/pull/21173