RFR: 8349142: [JMH] compiler.MergeLoadBench.getCharBV fails

[Shaojin Wen]

Fix the BUG caused by PR #22095 Change Unsafe base offset from int to long

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Commit messages:
 - bug fix
 - bug fix

Changes: https://git.openjdk.org/jdk/pull/23392/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23392&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8349142
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/23392.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23392/head:pull/23392

PR: https://git.openjdk.org/jdk/pull/23392