[riscv-port-jdk17u:riscv-port] RFR: 8296435: RISC-V: Small refactoring for increment/decrement

[Feilong Jiang]

On Tue, 25 Apr 2023 08:46:42 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Please review this backport to riscv-port-jdk17u.
> Backport of [JDK-8296435](https://bugs.openjdk.org/browse/JDK-8296435).
> The original patch cannot be directly applied because jdk17u has no [JDK-8286301](https://bugs.openjdk.org/browse/JDK-8286301).
> 
> Testing:
> - Tier1-3 passed without new failure on unmacthed (release).

Looks good, thanks.

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Marked as reviewed by fjiang (Author).

PR Review: https://git.openjdk.org/riscv-port-jdk17u/pull/48#pullrequestreview-1401053709