RFR: 8294715: Add IR checks to the reduction vectorization tests [v3]

[Fei Gao]

On Wed, 1 Mar 2023 12:33:20 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

> @fg1417 could you please run this patch on a machine with `sve` support? It would be good to know that all IR rules are ok.

Sure. I'll do the testing on our sve machine. Thanks.

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PR: https://git.openjdk.org/jdk/pull/12683