RFR: 8343984: Fix Unsafe address overflow

[Shaojin Wen]

In the JDK code, there are some places that may cause Unsafe offset overflow. The probability of occurrence is low, but if it occurs, it will cause JVM crash.

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Commit messages:
 - fix unsafe address overflow

Changes: https://git.openjdk.org/jdk/pull/22027/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22027&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343984
  Stats: 17 lines in 9 files changed: 0 ins; 0 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/22027.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22027/head:pull/22027

PR: https://git.openjdk.org/jdk/pull/22027