Remove dead code from IComponentShuffle

src/ImageSharp/Common/Helpers/Shuffle/IComponentShuffle.cs

@@ -227,41 +227,4 @@ namespace SixLabors.ImageSharp
             }
         }
     }
-
-    internal readonly struct XZWYShuffle4 : IShuffle4
-    {
-        public byte Control
-        {
-            [MethodImpl(InliningOptions.ShortMethod)]
-            get => SimdUtils.Shuffle.MmShuffle(1, 3, 2, 0);
-        }
-
-        [MethodImpl(InliningOptions.ShortMethod)]
-        public void RunFallbackShuffle(ReadOnlySpan<byte> source, Span<byte> dest)
-        {
-            ref uint sBase = ref Unsafe.As<byte, uint>(ref MemoryMarshal.GetReference(source));
-            ref uint dBase = ref Unsafe.As<byte, uint>(ref MemoryMarshal.GetReference(dest));
-            int n = source.Length / 4;
-
-            for (int i = 0; i < n; i++)
-            {
-                uint packed = Unsafe.Add(ref sBase, i);
-
-                // packed              = [W Z Y X]
-                // tmp1                = [0 0 0 X]
-                // tmp2                = [W Z 0 0]
-                // tmp3                = [0 0 Y 0]
-                // tmp4=ROTR(8, tmp2)  = [0 W Z 0]
-                // tmp5=ROTL(16, tmp3) = [Y 0 0 0]
-                // tmp1+ tmp3 + tmp4   = [Y W Z X]
-                uint tmp1 = packed & 0x000000FF;
-                uint tmp2 = packed & 0xFFFF0000;
-                uint tmp3 = packed & 0x0000FF00;
-                uint tmp4 = tmp2 >> 8;
-                uint tmp5 = tmp3 << 16;
-
-                Unsafe.Add(ref dBase, i) = tmp1 + tmp4 + tmp5;
-            }
-        }
-    }
 }