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/+/2679273Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72601}

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

@@ -1222,6 +1222,11 @@ 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

@@ -1791,6 +1791,11 @@ 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");