chore: cherry-pick fix for 1231950 from v8

[zcbenz]

[liftoff][arm64] Zero-extend offsets also for SIMD

This extends https://crrev.com/c/2917612 also for SIMD, which
(sometimes) uses the special {GetMemOpWithImmOffsetZero} method.
As part of this CL, that method is renamed to {GetEffectiveAddress}
which IMO is a better name. Also, it just returns a register to make the
semantic of that function obvious in the signature.

Drive-by: When sign extending to 32 bit, only write to the W portion of
the register. This is a bit cleaner, and I first thought that
this would be the bug.

R=jkummerow@chromium.org
CC=​thibaudm@chromium.org

Bug: chromium:1231950, v8:12018
Change-Id: Ifaefe1f18e3a00534a30c99e3c37ed09d9508f6e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3049073
Reviewed-by: Zhi An Ng zhin@chromium.org
Commit-Queue: Clemens Backes clemensb@chromium.org

[modify] https://crrev.com/b99fe75c6db86d86ad8989458d28978b001d9234/src/wasm/baseline/arm64/liftoff-assembler-arm64.h
[modify] https://crrev.com/b99fe75c6db86d86ad8989458d28978b001d9234/test/mjsunit/mjsunit.status
[add] https://crrev.com/b99fe75c6db86d86ad8989458d28978b001d9234/test/mjsunit/regress/wasm/regress-1231950.js

Notes: Security: Backported fix for 1231950.

[release-clerk]

Release Notes Persisted

Security: Backported fix for 1231950.

[trop]

I have automatically backported this PR to "11-x-y", please check out #30616

[trop]

I have automatically backported this PR to "12-x-y", please check out #30617