Patch af608d4b https://crrev.com/c/1903969 removed some functions used on mips platform.

Original Commit Message:

  [utils] Remove unused classes and functions

  This removes dead classes and functions from utils.h.

Change-Id: I558de38370b51a3f7dd0ea9712d9c9dc47fa05a1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1909747
Auto-Submit: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64927}