This reverts commit 12a9ee3a.

Reason for revert: Breaks arm64 sim bot

https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20-%20arm64%20-%20sim%20-%20debug/17467

Original change's description:
> [ptr-compr] Switch to 31 bit Smis on 64-bit architectures
> 
> 32 bit Smis are incompatible with pointer compression so we land disable
> them before enabling pointer compression in order to separate memory and
> performance regressions caused by 31 bit Smis from pointer compression
> change.
> 
> Bug: v8:9767
> Change-Id: I3d4a675df4208f808b1ba6e7816be545eae0dc24
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1815249
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#63934}

TBR=ishell@chromium.org,verwaest@chromium.org

Change-Id: Icc5a5b676a7f7d3fdb3fe3cf84007d4f9bce6eaf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:9767
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1815842Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63936}