[riscv-port-jdk17u:riscv-port] RFR: 8296916: RISC-V: Move some small macro-assembler functions to header file

[Fei Yang]

On Mon, 15 May 2023 10:17:20 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Please review this backport to riscv-port-jdk17u.
> Backport of [JDK-8296916](https://bugs.openjdk.org/browse/JDK-8296916).
> The original patch cannot be directly applied because jdk17u has no [JDK-8294100](https://bugs.openjdk.org/browse/JDK-8294100) with `MacroAssembler::object_move` and has no `vneg_v`, either.
> 
> Testing:
> 
> Tier1-3 passed without new failure on unmacthed (release).

Looks good. This change should be low risk and will help minimize difference with jdk mainline.

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Marked as reviewed by fyang (Lead).

PR Review: https://git.openjdk.org/riscv-port-jdk17u/pull/50#pullrequestreview-1431893724