Add a CreateFunctionContext implementation (which calls the same builtin
used by Sparkplug), and fix our deopt checkpoints to include the context
as a pseudo-register, so that Push/PopContext work with deopts.

Bug: v8:7700
Change-Id: Ia3efd105683f6922181b9f4c7db0bac6a3a5fcec
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3757683Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81664}