Wrapper nodes are merged into their corresponding C++ object nodes
when the reference between C++ and JS object has a wrapper class id
set.

Instead of iterating all global handles and checking for those with
class ids, the new algorithm discovers them while iterating C++
objects.

Note: Additional wrapper nodes, e.g., those from isolated worlds in
Blink are not merged.

Bug: chromium:1056170
Change-Id: I6dff8992e41d7a1a2c3b99a115a53df6b6fbb64c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2499661
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70804}