... diy-fp-unittest.

Bug: v8:12781
Change-Id: I7cb996c095ec0c946ed2db311dfd815e1cbd459b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3676643Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: 王澳 <wangao.james@bytedance.com>
Cr-Commit-Position: refs/heads/main@{#80831}