In most cases, I'm using ENTER_V8 which is due to the fact that the
respective methods might end up executing script, either because they
invoke some callback, or because they might trigger a proxy trap.

Also add microtask suppression scopes in the debugger to all the places
that need one according to tests.

BUG=v8:5830
R=marja@chromium.org,jgruber@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: I24cc3de37fc0d8156acfe86b290568e5f8f662b4
Reviewed-on: https://chromium-review.googlesource.com/519262
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46146}