Following up on https://crrev.com/c/1946349, this moves the blocklist to
the ScopeInfo instead of storing it directly on the DebugEvaluate
contexts. This is not the final state that we're looking for, but a
small step along the way.

Bug: chromium:1027475, v8:9938, chromium:1072939
Change-Id: I529f2fcacaf057a1236847bf0eb8e12cc1686515
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2910774Reviewed-by: Simon Zünd <szuend@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74724}