Added scopes to diallow/allow GCs from happening using a DCHECK. It is
stricter than DisallowHeapAllocation, since this also doesn't allow
safepoints.

As soon as Turbofan is ready, we can replace all usages of
DisallowHeapAllocation with DisallowGarbageCollection.

Bug: v8:10315
Change-Id: I12c144ec099d9af57d692ff343adbe7aec46c0c7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2362960Reviewed-by: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70042}