[riscv64] Fix build failed

Port 2b77ca20

Change-Id: Ie953a1d54f5529423ae35d1b1cd3ca25e8101c6e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2931577


Auto-Submit: Yahan Lu <yahan@iscas.ac.cn>
Commit-Queue: Brice Dobry <brice.dobry@futurewei.com>
Reviewed-by: Brice Dobry <brice.dobry@futurewei.com>
Cr-Commit-Position: refs/heads/master@{#74937}