This reverts commit e71b8022.

Reason for revert: Need to have a back-mergeable fix.

Original change's description:
> [deoptimizer] Staged materialization of objects.
> 
> The existing object materialization in the deoptimizer has the following problems:
> 
> - Objects do not necessarily verify during materialization (because during the
>   depth first walk we might have inconsistent objects).
> 
> - Stack can overflow (because we just materialize using recursive calls).
> 
> - We generalize object fields.
> 
> 
> This CL re-implements the materialization algorithm to solve this problem. The
> new implementation creates the objects in two steps:
> 
> 1. We allocate space for all the objects. In general, we allocate ByteArrays
>    of the right size. For leaf objects that cannot participate in cycles,
>    we build and initialize the materialized objects completely.
> 
>    For JS objects, we insert markers into the byte array at the positions
>    where unboxed doubles are expected.
> 
> 2. We initialize all the objects with the proper field values and change the
>    map from the ByteArray map to the correct map. This requires some sync
>    with the concurrent marker (Heap::NotifyObjectLayoutChange).
> 
>    When initializing the JS object fields, we make sure that we respect
>    the unboxed double marker.
> 
> Bug: chromium:770106, v8:3836
> Change-Id: I1ec466a9d19db9538df4ba915516d4c3ca825632
> Reviewed-on: https://chromium-review.googlesource.com/777559
> Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#49821}

TBR=ulan@chromium.org,mstarzinger@chromium.org,jarin@chromium.org

Change-Id: I0657fb75330700dd7883c600dacb25676ebb47f9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:770106, v8:3836
Reviewed-on: https://chromium-review.googlesource.com/806160Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49834}