Those fields are incorrect in FreeBSD.
Upstreaming local FreeBSD patches.

Change-Id: I28cf6dbec1d5e4d26e62dd9a0d78d039c3e36cdb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1906374Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65226}