This reverts commit cb84b6f6.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> [lazy-accessor-pairs] Don't take the fast paths if the context needs to be switched
> 
> This works in the ICs since compiled handlers are not shared anymore.
> 
> As drive-by cleanup I also removed custom code to deal with compiled handler sharing for primitive and access-checked objects.
> 
> Bug: chromium:759734
> Change-Id: Ifb394221c2398f42ea9305acc02845db6004c680
> Reviewed-on: https://chromium-review.googlesource.com/738381
> Commit-Queue: Toon Verwaest <verwaest@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48979}

TBR=jarin@chromium.org,ishell@chromium.org,verwaest@chromium.org

Change-Id: I9b7424252cbc3f18efd6b6b5b3818651c2863f5c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:759734
Reviewed-on: https://chromium-review.googlesource.com/739487Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48980}