Remove StoreToFrame and the general diff encoding for checkpoints, and
instead make all Checkpoints immediately copy the live part of the
interpreter frame state.

This means that we don't need to recreate the frame state during graph
processing, and we don't have to copy the checkpoint's state for storing
in the deferred DeoptimizationInfo.

In theory the diff encoding was meant to save zone memory for unused
checkpoints, and for checkpoints that don't differ much from each other.
However,

  a) We expect to do most checkpoint elimination during graph building,
     so the assumption that many checkpoints will be unused seems less
     probable, and

  b) We need to copy the checkpoint's frame state for emitting deopts,
     so we don't actually end up avoiding doing the copies.

So, we can simplify things by removing this complexity.

Bug: v8:7700
Change-Id: Iff9743fabbf7a017cccf0ece76a797c571764ea6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3545178Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79602}