This reverts commit 68612784.

Reason for revert: I'll follow Jakob's suggestion and fix unaligned accesses in C++ with ReadUnalignedValue().

Original change's description:
> [build] Suppress UBSan alignment checks in pointer compression
> 
> It is a design decision of pointer compression to allow unaligned pointers,
> so disable this check in UBSan.
> 
> Bug: v8:7703
> Change-Id: I3fab34e77ad755cdef3cd385a3615e3d0e350c16
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1523346
> Commit-Queue: Leszek Swirski <leszeks@chromium.org>
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Auto-Submit: Leszek Swirski <leszeks@chromium.org>
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#60235}

TBR=jkummerow@chromium.org,machenbach@chromium.org,leszeks@chromium.org,verwaest@chromium.org

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

Bug: v8:7703
Change-Id: I17e669e7b5e2dea8f0686911730d27f3d2732b85
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1526200Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60283}