RFR: 8343689: AArch64: Optimize MulReduction implementation

[Mikhail Ablakatov]

On Tue, 4 Feb 2025 18:48:38 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

> This could also be a relevant Benchmark:
./test/micro/org/openjdk/bench/vm/compiler/VectorReduction2.java

Thank you for pointing this out. I didn't take an effect on auto-vectorization into consideration, though I should. I'll revert on this in a bit.

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PR Comment: https://git.openjdk.org/jdk/pull/23181#issuecomment-2636684622