RFR: 8308236: Remove SystemDictionaryShared::clone_dumptime_tables()

[Ioi Lam]

This function was necessary because we were patching the pointers inside `SystemDictionaryShared::_dumptime_table` when dumping the CDS archive. We no longer do that since [JDK-8307567](https://bugs.openjdk.org/browse/JDK-8307567), so this function and related code can be removed.

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Commit messages:
 - 8308236: Remove ::clone_dumptime_tables()

Changes: https://git.openjdk.org/jdk/pull/14020/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14020&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308236
  Stats: 161 lines in 8 files changed: 0 ins; 161 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14020.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14020/head:pull/14020

PR: https://git.openjdk.org/jdk/pull/14020