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

[Doug Simon]

On Mon, 10 Feb 2025 18:54:26 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   copyright
>
> Re dougxc: This migration is specific to the Java language. I am not so sure about the C++ counterparts, especially that C++ has unsigned types that can complicate things. Another motivation of the Java change is that unsafe is widely used in the Java codebase so upgrading the type can potentially make future usages safer. For example, this already revealed a misuse of the array base offset in the benchmarks in #23393.

Thanks for the clarification @liach . This means we only need to focus on the Java code in https://bugs.openjdk.org/browse/JDK-8349743 (cc @mur47x111).

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PR Comment: https://git.openjdk.org/jdk/pull/22095#issuecomment-2649300214