RFR: 8302453: RISCV: Add support for small width vector operations [v3]

[Gui Cao]

On Wed, 15 Feb 2023 13:10:12 GMT, Fei Yang <fyang at openjdk.org> wrote:

> Better to introduce another parameter to receive a temporary register and set 't0' as the default.

Thanks for the suggestion, fixed.

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