RFR: 8286941: Add mask IR for partial vector operations for ARM SVE [v8]

[Xiaohong Gong]

On Thu, 30 Jun 2022 17:51:34 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> An other test failed in tier2: compiler/loopopts/superword/TestPickFirstMemoryState.java Details are in RFE.

Thanks for the tests again! It seems this is the same issue with https://github.com/openjdk/jdk/pull/2867 that the type of `in(2)` is `Type::TOP`. We need to add save the vector type for `ReductionNode`. I will fix it soon!

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PR: https://git.openjdk.org/jdk/pull/9037