Reverted some pinning changes to have less verbose C# code

src/ImageSharp/Common/Helpers/SimdUtils.HwIntrinsics.cs

@@ -673,7 +673,7 @@ internal static partial class SimdUtils
             ReadOnlySpan<byte> source,
             Span<float> dest)
         {
-            fixed (byte* sourceBase = &MemoryMarshal.GetReference(source))
+            fixed (byte* sourceBase = source)
             {
                 if (Avx2.IsSupported)
                 {

src/ImageSharp/Compression/Zlib/Adler32.cs

@@ -387,7 +387,7 @@ internal static class Adler32
         uint s1 = adler & 0xFFFF;
         uint s2 = (adler >> 16) & 0xFFFF;
 
-        fixed (byte* bufferPtr = &MemoryMarshal.GetReference(buffer))
+        fixed (byte* bufferPtr = buffer)
         {
             byte* localBufferPtr = bufferPtr;
             uint length = (uint)buffer.Length;

src/ImageSharp/Compression/Zlib/Crc32.cs

@@ -81,7 +81,7 @@ internal static partial class Crc32
         int chunksize = buffer.Length & ~ChunksizeMask;
         int length = chunksize;
 
-        fixed (byte* bufferPtr = &MemoryMarshal.GetReference(buffer))
+        fixed (byte* bufferPtr = buffer)
         {
             fixed (ulong* k05PolyPtr = K05Poly)
             {
@@ -201,7 +201,7 @@ internal static partial class Crc32
     [MethodImpl(InliningOptions.HotPath | InliningOptions.ShortMethod)]
     private static unsafe uint CalculateArm(uint crc, ReadOnlySpan<byte> buffer)
     {
-        fixed (byte* bufferPtr = &MemoryMarshal.GetReference(buffer))
+        fixed (byte* bufferPtr = buffer)
         {
             byte* localBufferPtr = bufferPtr;
             int len = buffer.Length;
@@ -248,7 +248,7 @@ internal static partial class Crc32
     [MethodImpl(InliningOptions.HotPath | InliningOptions.ShortMethod)]
     private static unsafe uint CalculateArm64(uint crc, ReadOnlySpan<byte> buffer)
     {
-        fixed (byte* bufferPtr = &MemoryMarshal.GetReference(buffer))
+        fixed (byte* bufferPtr = buffer)
         {
             byte* localBufferPtr = bufferPtr;
             int len = buffer.Length;

src/ImageSharp/Formats/Webp/Lossless/LosslessUtils.cs

@@ -569,7 +569,7 @@ internal static unsafe class LosslessUtils
         Span<uint> pixelData,
         Span<uint> outputSpan)
     {
-        fixed (uint* inputFixed = &MemoryMarshal.GetReference(pixelData))
+        fixed (uint* inputFixed = pixelData)
         {
             fixed (uint* outputFixed = outputSpan)
             {

src/ImageSharp/Formats/Webp/Lossless/PredictorEncoder.cs

@@ -353,8 +353,8 @@ internal static unsafe class PredictorEncoder
         else
         {
 #pragma warning disable SA1503 // Braces should not be omitted
-            fixed (uint* currentRow = &MemoryMarshal.GetReference(currentRowSpan))
-            fixed (uint* upperRow = &MemoryMarshal.GetReference(upperRowSpan))
+            fixed (uint* currentRow = currentRowSpan)
+            fixed (uint* upperRow = upperRowSpan)
             {
                 for (int x = xStart; x < xEnd; x++)
                 {
@@ -664,9 +664,9 @@ internal static unsafe class PredictorEncoder
         Span<short> scratch)
     {
 #pragma warning disable SA1503 // Braces should not be omitted
-        fixed (uint* current = &MemoryMarshal.GetReference(currentSpan))
-        fixed (uint* upper = &MemoryMarshal.GetReference(upperSpan))
-        fixed (uint* outputFixed = &MemoryMarshal.GetReference(outputSpan))
+        fixed (uint* current = currentSpan)
+        fixed (uint* upper = upperSpan)
+        fixed (uint* outputFixed = outputSpan)
         {
             uint* output = outputFixed;
             if (xStart == 0)

src/ImageSharp/Formats/Webp/WebpCommonUtils.cs

@@ -81,7 +81,7 @@ internal static class WebpCommonUtils
             ReadOnlySpan<byte> rowBytes = MemoryMarshal.AsBytes(row);
             int i = 0;
             int length = (row.Length * 4) - 3;
-            fixed (byte* src = &MemoryMarshal.GetReference(rowBytes))
+            fixed (byte* src = rowBytes)
             {
                 for (; i + 64 <= length; i += 64)
                 {

src/ImageSharp/Memory/Buffer2DExtensions.cs

@@ -50,7 +50,7 @@ public static class Buffer2DExtensions
 
         Span<byte> span = MemoryMarshal.AsBytes(buffer.DangerousGetSingleMemory().Span);
 
-        fixed (byte* ptr = &MemoryMarshal.GetReference(span))
+        fixed (byte* ptr = span)
         {
             byte* basePtr = ptr;
             for (int y = 0; y < buffer.Height; y++)