OutputRegister does not always exist, so we add a TempRegister to store
the comparison result.

Change-Id: I47b2500c28be85a66cab1de669ed62401f878e1a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2885475
Auto-Submit: Liu yu <liuyu@loongson.cn>
Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#74554}