RFR: 8343689: AArch64: Optimize MulReduction implementation [v8]

[Andrew Haley]

On Wed, 13 Aug 2025 09:46:05 GMT, Mikhail Ablakatov <mablakatov at openjdk.org> wrote:

> I assume you might have misinterpreted **predicated** SVE bitwise shift for **unpredicated**.

It's possible. The point is to make sure that any new instruction is in a section corresponding to its section in hte Decoding tables. Please make your best guess as to where that should be, and we'll discuss it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23181#discussion_r2273264531