RFR: 8344168: Change Unsafe base offset from int to long [v7]

[Shaojin Wen]

> The type of the Unsafe base offset constant is int, which may cause overflow when adding int offsets, such as 8343925 (PR #22012). 8343984 (PR #22027) fixes most of the offset overflows in JDK, but ArraysSupport and CRC32C are still unfixed.
> 
> @liach proposed the idea of ​​changing the Unsafe base offset to long, which is a complete solution to the Unsafe offset overflow. After discussing with @liach, I submitted this PR to implement @liach's idea.

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

  copyright

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22095/files
  - new: https://git.openjdk.org/jdk/pull/22095/files/d1d5bdfe..3e16ea0d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22095&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22095&range=05-06

  Stats: 49 lines in 49 files changed: 0 ins; 0 del; 49 mod
  Patch: https://git.openjdk.org/jdk/pull/22095.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22095/head:pull/22095

PR: https://git.openjdk.org/jdk/pull/22095