This reverts commit 2261e053.

Reason for revert: No issues with the CL, but it is taking the
last two available opcodes on arm64 (we use 9 bits to encode it,
so we are limited to 512 opcodes). We need to land a security fix
which includes the addition of two opcodes. Before relanding this,
we need to figure out a strategy to either reduce opcodes, or use
one more bit to encode them.

Original change's description:
> [arm64][wasm] Use NEON S/Usra for Wasm SIMD add(shr(x, imm), y)
>
> A single AArch64 SIMD signed/unsigned Shift Right and Accumulate can be
> used to implement Wasm SIMD add(shr(x, imm), y). This gives a 1-1.5%
> improvement on some compute intensive Wasm benchmarks on Neoverse-N1.
>
> Mla and Adalp optimisations were refactored to match the style of the
> added code.
>
> Change-Id: Id5959a31ca267e02b7d60e7ff6f942adb029b41e
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3089157
> Reviewed-by: Zhi An Ng <zhin@chromium.org>
> Commit-Queue: Martyn Capewell <martyn.capewell@arm.com>
> Cr-Commit-Position: refs/heads/master@{#76280}

Change-Id: Ifad0625ed8a6b66e7a7a74da11ad7d60941207e5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3094014
Auto-Submit: Clemens Backes <clemensb@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@{#76282}