This reverts commit 8b74fd45.

Reason for revert: Blocking the roll into Chromium, example failure on Windows 64 bot:

https://ci.chromium.org/p/chromium/builders/try/win10_chromium_x64_rel_ng/863189?

Original change's description:
> Reland^3 "[ptr-cage] Turn on shared pointer cage by default for arm64 and x64""
>
> This is a reland of 054ff044
>
> Change since revert:
>
> - Remove assignment to FLAG_enable_short_builtins in test since
>   it's write-once in CFI.
>
> Original change's description:
> > Reland^2 "[ptr-cage] Turn on shared pointer cage by default for arm64 and x64"
> >
> > This is a reland of 1f504c36
> >
> > Changes since revert:
> >
> > - Removed disabling of RO heap sharing when --stress-snapshot is passed;
> >   was fixed by f4a6c628
> > - Fixed crashing tests that caused revert separately in
> >   a61aa491
> >
> > Original change's description:
> > > > [ptr-cage] Turn on shared pointer cage by default for arm64 and x64
> > > >
> > > > Reviewed-on:
> > > https://chromium-review.googlesource.com/c/v8/v8/+/2873226
> > > > Reviewed-by: Igor Sheludko <ishell@chromium.org>
> > > > Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
> > > > Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> > > > Cr-Commit-Position: refs/heads/master@{#74422}
> > >
> > > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2878855
> > > Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
> > > Reviewed-by: Adam Klein <adamk@chromium.org>
> > > Reviewed-by: Igor Sheludko <ishell@chromium.org>
> > > Reviewed-by: Dan Elphick <delphick@chromium.org>
> > > Cr-Commit-Position: refs/heads/master@{#74448}
> >
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2891460
> > Reviewed-by: Adam Klein <adamk@chromium.org>
> > Commit-Queue: Shu-yu Guo <syg@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#74546}
>
> TBR=adamk@chromium.org
>
> Bug: v8:11460
> Change-Id: Ib7526270d421a562cb00aec9a28b4fc2296e4a86
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2893567
> Reviewed-by: Shu-yu Guo <syg@chromium.org>
> Reviewed-by: Adam Klein <adamk@chromium.org>
> Commit-Queue: Shu-yu Guo <syg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#74548}

Bug: v8:11460
Change-Id: Ie1a6a5d7e7928f6b90571a33dc743ca5d1d082b4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2893823
Auto-Submit: Bill Budge <bbudge@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#74557}