RFR: 8347606: Optimize Java implementation of ML-DSA

[Johannes Graham]

On Fri, 14 Feb 2025 16:43:32 GMT, Ben Perez <bperez at openjdk.org> wrote:

> It turns out that initializing a multidimensional array with `int[][] a = new int[rows][cols]` is slower than allocating each column in a loop. Since we do a lot of large multidimensional array allocations in ML-DSA, the optimized initialization improves performance by roughly 10%.

This PR might be relevant: https://github.com/openjdk/jdk/pull/22829

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PR Comment: https://git.openjdk.org/jdk/pull/23642#issuecomment-2675219511