The ScopeIterator only requires accurate information for the whole
script during local debug-evaluate, when the accurate scope information
is used to build stack local blacklists. Otherwise it is enough to only
reparse the closure. This should recover some performance during
stepping, especially with large stacks and scripts.

Drive-by: Remove unused COLLECT_NON_LOCALS enum option.

Bug: chromium:1028093, v8:9938
Change-Id: I6b3a34e9015e564d683e76b88388daabc426e1cb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1948715
Commit-Queue: Simon Zünd <szuend@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65318}