RFR: 8378833: Improve offset arithmetic in ArraysSupport::mismatch

[Chen Liang]

On Fri, 27 Feb 2026 12:35:51 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

> Some of the `ArraysSupport::mismatch` family of methods compute offsets using a mix of `int` and `long` arithmetic.
> This can lead to wrong results, which are then passed as arguments to an intrinsic method or to a Java method using `Unsafe`.

And this is exactly why the base offsets are statically typed long in the first place...

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Marked as reviewed by liach (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/29957#pullrequestreview-3866770156