RFR: 8343984: Fix Unsafe address overflow [v6]

[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.

Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:

  more fix unsafe address overflow

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22027/files
  - new: https://git.openjdk.org/jdk/pull/22027/files/f8f58546..97615464

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22027&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22027&range=04-05

  Stats: 6 lines in 2 files changed: 0 ins; 0 del; 6 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