RFR: 8351839: RISC-V: Fix base offset calculation introduced in JDK-8347489

[Fei Yang]

On Thu, 13 Mar 2025 07:31:22 GMT, Feilong Jiang <fjiang at openjdk.org> wrote:

> looks good, thanks.

Thanks for the review!

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PR Comment: https://git.openjdk.org/jdk/pull/24006#issuecomment-2721026759