git: openjdk/jdk17u-dev: 8319525: RISC-V: Rename *_riscv64.ad files to *_riscv.ad under riscv/gc

[Fei Yang]

Changeset: 312f8c05
Author:    Feilong Jiang <fjiang at openjdk.org>
Committer: Fei Yang <fyang at openjdk.org>
Date:      2023-11-10 02:39:24 +0000
URL:       https://git.openjdk.org/jdk17u-dev/commit/312f8c0594904d32af1c9a0c898aa14514821598

8319525: RISC-V: Rename *_riscv64.ad files to *_riscv.ad under riscv/gc

Reviewed-by: fyang
Backport-of: b2504a0f9cff1f4fdf8f5bb20c4b48a53ba0be77

= src/hotspot/cpu/riscv/gc/shenandoah/shenandoah_riscv.ad
= src/hotspot/cpu/riscv/gc/z/z_riscv.ad