Actually call arm methods, if arm is supported

src/ImageSharp/Compression/Zlib/Adler32.cs

@@ -71,6 +71,11 @@ internal static class Adler32
             return CalculateSse(adler, buffer);
         }
 
+        if (AdvSimd.IsSupported)
+        {
+            return CalculateArm(adler, buffer);
+        }
+
         return CalculateScalar(adler, buffer);
     }
 

src/ImageSharp/Compression/Zlib/Crc32.cs

@@ -61,6 +61,16 @@ internal static partial class Crc32
             return ~CalculateSse(~crc, buffer);
         }
 
+        if (ArmCrc32.Arm64.IsSupported)
+        {
+            return ~CalculateArm64(~crc, buffer);
+        }
+
+        if (ArmCrc32.IsSupported)
+        {
+            return ~CalculateArm(~crc, buffer);
+        }
+
         return ~CalculateScalar(~crc, buffer);
     }