This reverts commit 16aecc5d.

Reason for revert: Breaks several layout tests:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/22624

Original change's description:
> Ship BigInts
> 
> Intent to ship:
> https://groups.google.com/d/msg/v8-users/ShhW0Xewph0/1-OT9q0_DQAJ
> 
> Bug: v8:6791
> Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
> Change-Id: Ibcf5ac09c0099496ef2c6a3c23bef9f9e72658f1
> Reviewed-on: https://chromium-review.googlesource.com/981596
> Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
> Reviewed-by: Mathias Bynens <mathias@chromium.org>
> Reviewed-by: Adam Klein <adamk@chromium.org>
> Reviewed-by: Georg Neis <neis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#52256}

TBR=adamk@chromium.org,jkummerow@chromium.org,neis@chromium.org,mathias@chromium.org

Change-Id: I32e9f32b501cb72aa364e89d5b2210c0861c68fc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:6791
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/983293Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52261}