The original commit implementing private accessor propertiers (*) claims
it's not a thing, but it is.

(*) https://chromium-review.googlesource.com/c/v8/v8/+/1695205/11/src/interpreter/bytecode-generator.cc#3959

Bug: v8:11360, v8:8330
Change-Id: If497f2b6a77dc28e4ade4ef78d901299f4e37593
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2652495Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Joyee Cheung <joyee@igalia.com>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72411}