Jpeg encoder no uses Numerics.Log2 as fallback

src/ImageSharp/Common/Helpers/Numerics.cs

@@ -861,7 +861,7 @@ namespace SixLabors.ImageSharp
         /// https://cstheory.stackexchange.com/questions/19524/using-the-de-bruijn-sequence-to-find-the-lceil-log-2-v-rceil-of-an-integer
         /// </remarks>
         /// <param name="value">The value.</param>
-        internal static int Log2SoftwareFallback(uint value)
+        private static int Log2SoftwareFallback(uint value)
         {
             // No AggressiveInlining due to large method size
             // Has conventional contract 0->0 (Log(0) is undefined) by default, no need for if checking

src/ImageSharp/Formats/Jpeg/Components/Encoder/HuffmanScanEncoder.cs

@@ -420,7 +420,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Encoder
             // Because of the 16 bit value constraint it won't overflow
             // With that input value change we no longer need to add 1 before returning
             // And this eliminates need to check if input value is zero - it is a standard convention which Log2SoftwareFallback adheres to
-            return Numerics.Log2SoftwareFallback(value << 1);
+            return Numerics.Log2(value << 1);
 #endif
         }
     }