This reverts commit e43ec59b.

Reason for revert: https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket.appspot.com/8869719317069732832/+/steps/Check_-_d8/0/logs/externref-globals-liftoff/0

Original change's description:
> [wasm][liftoff] Support for most externref globals
> 
> With this CL we add support for all externref globals except for
> imported mutable globals.
> 
> R=​thibaudm@chromium.org
> 
> Bug: v8:7581
> Change-Id: I63cb26f8ad6f4b8fc1c276e223c5d45745122ebf
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2396086
> Commit-Queue: Andreas Haas <ahaas@chromium.org>
> Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#69741}

TBR=ahaas@chromium.org,thibaudm@chromium.org

Change-Id: I19d191862aa91a116ea84a4a59a3a0a8036fcb49
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7581
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2398643
Commit-Queue: Sathya Gunasekaran  <gsathya@chromium.org>
Reviewed-by: Sathya Gunasekaran  <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69744}