This reverts commit bbd740f0.

Reason for revert: blocks lkgr due to layout test failure:
https://ci.chromium.org/p/v8/builders/ci/V8-Blink%20Linux%2064/31607

Original change's description:
> Reland "[json] Speed up json parsing"
> 
> This is a reland of b0c4a876
> 
> Original change's description:
> > [json] Speed up json parsing
> >
> > - scan using raw data pointers + GC callback
> > - scan using scanner tables
> > - cap internalizing large string values
> > - inline fast transitioning logic
> >
> > Fixes previous CL by moving AllowHeapAllocation to callers of
> > ReportUnexpectedCharacter where needed to make it clear we need to exit.
> >
> > Tbr: ulan@chromium.org
> > Change-Id: Icfbb7cd536e0fbe153f34acca5d0fab6b5453d71
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1591778
> > Reviewed-by: Igor Sheludko <ishell@chromium.org>
> > Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> > Commit-Queue: Toon Verwaest <verwaest@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#61159}
> 
> Tbr: verwaest@chromium.org
> Cq-Include-Trybots: luci.v8.try:v8_linux64_msan_rel
> Change-Id: Ic7d0057178c649fc45b8c8f4587ee9128e351515
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1593292
> Commit-Queue: Igor Sheludko <ishell@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#61179}

TBR=ulan@chromium.org,ishell@google.com,verwaest@google.com,ishell@chromium.org,verwaest@chromium.org

Change-Id: I3ae8f9ce8214bebe7fab9d87c5daf8cdfdb94199
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Cq-Include-Trybots: luci.v8.try:v8_linux64_msan_rel
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1594438
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61194}