[riscv-port-jdk17u:riscv-port] RFR: 8301818: RISC-V: Factor out function mvw from MacroAssembler

[Fei Yang]

On Fri, 26 May 2023 14:27:17 GMT, Gui Cao <gcao at openjdk.org> wrote:

> Hi,
> Please help review this backport to riscv-port-jdk17u.
> Backport of [JDK-8301818](https://bugs.openjdk.org/browse/JDK-8301818), and [JDK-8302114](https://bugs.openjdk.org/browse/JDK-8302114).
> Because there is no [JDK-8286301](https://bugs.openjdk.org/browse/JDK-8286301), [JDK-8290154](https://bugs.openjdk.org/browse/JDK-8290154) here in riscv-port-jdk17u, it will show not clean.
> 
> Testing:
> 
> Tier1-3 passed without new failure on unmacthed (release).

Looks good.

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Marked as reviewed by fyang (Lead).

PR Review: https://git.openjdk.org/riscv-port-jdk17u/pull/62#pullrequestreview-1452406334