[wasm-simd][liftoff][ia32][x64] Add missing CpuFeatureScope

pshufb is a SSSE3 feature and so requires the scope before using.

Change-Id: I42cf252079ba9aa9b09c2197a0e20b90ebc27b5d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2500927Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70813}

src/wasm/baseline/ia32/liftoff-assembler-ia32.h

@@ -2712,6 +2712,7 @@ void LiftoffAssembler::emit_i8x16_shuffle(LiftoffRegister dst,
       if (dst != lhs) {
         movups(dst.fp(), lhs.fp());
       }
+      CpuFeatureScope sse_scope(this, SSSE3);
       pshufb(dst.fp(), Operand(esp, 0));
     }
     mov(esp, tmp.gp());

src/wasm/baseline/x64/liftoff-assembler-x64.h

@@ -2336,6 +2336,7 @@ void LiftoffAssembler::emit_i8x16_shuffle(LiftoffRegister dst,
       if (dst != lhs) {
         movups(dst.fp(), lhs.fp());
       }
+      CpuFeatureScope sse_scope(this, SSSE3);
       pshufb(dst.fp(), kScratchDoubleReg);
     }
     return;