This reverts commit aa984947.

Reason for revert: Unexpectedly regresses SixSpeed benchmarks. Will reland a fix without refactoring.

Original change's description:
> [ptr-compr] Fix 32-bit smis on non-ptr-compr builds
> 
> Bug: v8:10047, v8:10257
> Change-Id: Ifcc65235726420fe753e26707d84061400d5d2b1
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2050384
> Commit-Queue: Igor Sheludko <ishell@chromium.org>
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#66415}

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

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: v8:10047, v8:10257
Change-Id: Ic3253652adcce457cf0810baa0eb09cc9a383ceb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2077913Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66481}