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

[Fei Yang]

On Mon, 6 Nov 2023 11:35:38 GMT, Feilong Jiang <fjiang at openjdk.org> wrote:

> Hi, please review this trivial patch that renames `*_riscv64.ad` files to `*_riscv.ad`.
> In the early development at jdk-sandbox, there was a commit [1] that renamed all filenames from riscv64 to riscv, but some `.ad` files under `riscv/gc` were missed.
> 
> 1. https://github.com/openjdk/jdk-sandbox/commit/5500685c274b1b96c1dd5440b5203432081cc679
> 
> 
> Testing
> - [x] release build
> - [x]  hotspot:tier1

Marked as reviewed by fyang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16521#pullrequestreview-1716681977