Brokerize parts of named property access.

Bug: v8:7790
Change-Id: I465bced5f266969040d1e966946a162b0a850c5b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1596734Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61414}