This new scope allows to avoid emitting calls to {Builtin::kAbort} in
debug code when requested, but still trap when the debug code fails. It
can be used to keep generated code independent of builtins.

R=jgruber@chromium.org

Change-Id: I77864a1a10ec5b52bccfd76981ab5f4ff33bc727
Reviewed-on: https://chromium-review.googlesource.com/1095179
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53635}