[riscv64] Fix RvvGts emit wrong instr

Change-Id: Icd2ed5c6e54dec208afa9a09b0e4fe9bcd410687
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3167438


Commit-Queue: Yahan Lu <yahan@iscas.ac.cn>
Commit-Queue: Ji Qiu <qiuji@iscas.ac.cn>
Reviewed-by: Ji Qiu <qiuji@iscas.ac.cn>
Cr-Commit-Position: refs/heads/main@{#76898}