This reverts commit 453e1a3b.

Reason for revert: Makes UBSan unhappy - https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20UBSan/9893

Original change's description:
> [offthread] Add SFI support to OffThreadFactory
> 
> Add support for off-thread SharedFunctionInfo allocation, which
> includes UncompiledData and PreparseData allocation.
> 
> Bug: chromium:1011762
> Change-Id: Ia10f9ce762c7d7eb1108b9e71da75131dce919b7
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2050393
> Commit-Queue: Leszek Swirski <leszeks@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#66246}

TBR=ulan@chromium.org,leszeks@chromium.org,ishell@chromium.org

Change-Id: I26bc40ec1c351613f19745aed83f0c3a9fdd9a20
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1011762
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2052172Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66247}