RFR: 8302453: RISCV: Add support for small width vector operations [v6]

[Gui Cao]

On Sat, 18 Feb 2023 06:28:08 GMT, Fei Yang <fyang at openjdk.org> wrote:

> We can make use of 'vsetivli' instruction when the number of elements to be processed is not bigger than 31. That will help save one 'mv' instruction in this case.

Thanks, it has been fixed.

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PR: https://git.openjdk.org/jdk/pull/12553