This CL modifies the underlying storage of PerIsolateAssertScope from
a bitfield to separate booleans. This slightly increases the space taken
by the isolate, but allows for easier access to the individual fields,
which is a prerequisite for implementing assertion scopes in TurboFan.

It also refactors the template PerIsolateAssertScope class to separate
simple C++ scope classes, defined through macros.

Bug: chromium:1218898
Change-Id: Ia5e43352ebba28be6f013376b75f13ec8d5dc972
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2975303
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75369}