Currently these events are emitted by Blink in GC prologue/epilogue.
That however does not respect event nesting and breaks with future
perfetto changes. This CL emits the events inside V8 using a scope to
guarantee proper event nesting. The events are same except for the
"type" argument that now gets more detailed information.

The corresponding Blink CL that removes these trace events:
https://chromium-review.googlesource.com/c/chromium/src/+/1929227

Bug: chromium:1026658
Change-Id: Ifbfab647f40f81af7acf315ff4608b9dc9444f94
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1928857Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65120}