Moved SpanAction fields to top of class

Cf. #31850 (comment)

Author: gfoidl

src/Shared/ServerInfrastructure/StringUtilities.cs

@@ -18,6 +18,9 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure
     internal static class StringUtilities
     {
         private static readonly SpanAction<char, IntPtr> s_getAsciiOrUTF8StringNonNullCharacters = GetAsciiStringNonNullCharactersWithMarker;
+        private static readonly SpanAction<char, IntPtr> s_getAsciiStringNonNullCharacters = GetAsciiStringNonNullCharacters;
+        private static readonly SpanAction<char, IntPtr> s_getLatin1StringNonNullCharacters = GetLatin1StringNonNullCharacters;
+        private static readonly SpanAction<char, (string? str, char separator, uint number)> s_populateSpanWithHexSuffix = PopulateSpanWithHexSuffix;
 
         public static unsafe string GetAsciiOrUTF8StringNonNullCharacters(this ReadOnlySpan<byte> span, Encoding defaultEncoding)
         {
@@ -67,8 +70,6 @@ private static unsafe void GetAsciiStringNonNullCharactersWithMarker(Span<char>
             }
         }
 
-        private static readonly SpanAction<char, IntPtr> s_getAsciiStringNonNullCharacters = GetAsciiStringNonNullCharacters;
-
         public static unsafe string GetAsciiStringNonNullCharacters(this ReadOnlySpan<byte> span)
         {
             if (span.IsEmpty)
@@ -95,8 +96,6 @@ private static unsafe void GetAsciiStringNonNullCharacters(Span<char> buffer, In
             }
         }
 
-        private static readonly SpanAction<char, IntPtr> s_getLatin1StringNonNullCharacters = GetLatin1StringNonNullCharacters;
-
         public static unsafe string GetLatin1StringNonNullCharacters(this ReadOnlySpan<byte> span)
         {
             if (span.IsEmpty)
@@ -692,8 +691,6 @@ private static bool IsValidHeaderString(string value)
             }
         }
 
-        private static readonly SpanAction<char, (string? str, char separator, uint number)> s_populateSpanWithHexSuffix = PopulateSpanWithHexSuffix;
-
         /// <summary>
         /// A faster version of String.Concat(<paramref name="str"/>, <paramref name="separator"/>, <paramref name="number"/>.ToString("X8"))
         /// </summary>