Revert "PPC/s390: [wasm-simd][liftoff] Implement i8x16.popcnt"

This reverts commit 21b3181a.

Reason for revert: Original CL is reverted.

Original change's description:
> PPC/s390: [wasm-simd][liftoff] Implement i8x16.popcnt
>
> Port 00babf07
>
> Original Commit Message:
>
>     Extract i8x16.popcnt implementation into a macro-assembler function, and
>     reuse it in Liftoff.
>
> R=​zhin@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
> BUG=
> LOG=N
>
> Change-Id: Id0f14597a97f90424aa450b2527ea71da1b2e8ce
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2679273
> Reviewed-by: Junliang Yan <junyan@redhat.com>
> Commit-Queue: Junliang Yan <junyan@redhat.com>
> Cr-Commit-Position: refs/heads/master@{#72601}

TBR=joransiu@ca.ibm.com,zhin@chromium.org,mfarazma@redhat.com,midawson@redhat.com,junyan@redhat.com

Change-Id: I54dd854e305d0fbbd475c0f756bc41acac74fa56
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2685060Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72604}

src/wasm/baseline/ppc/liftoff-assembler-ppc.h

@@ -1222,11 +1222,6 @@ void LiftoffAssembler::emit_i8x16_shuffle(LiftoffRegister dst,
   bailout(kSimd, "i8x16_shuffle");
 }
 
-void LiftoffAssembler::emit_i8x16_popcnt(LiftoffRegister dst,
-                                         LiftoffRegister src) {
-  bailout(kSimd, "i8x16.popcnt");
-}
-
 void LiftoffAssembler::emit_i8x16_splat(LiftoffRegister dst,
                                         LiftoffRegister src) {
   bailout(kUnsupportedArchitecture, "emit_i8x16splat");

src/wasm/baseline/s390/liftoff-assembler-s390.h

@@ -1791,11 +1791,6 @@ void LiftoffAssembler::emit_i8x16_shuffle(LiftoffRegister dst,
   bailout(kSimd, "i8x16_shuffle");
 }
 
-void LiftoffAssembler::emit_i8x16_popcnt(LiftoffRegister dst,
-                                         LiftoffRegister src) {
-  bailout(kSimd, "i8x16.popcnt");
-}
-
 void LiftoffAssembler::emit_i8x16_splat(LiftoffRegister dst,
                                         LiftoffRegister src) {
   bailout(kUnsupportedArchitecture, "emit_i8x16splat");