Use IndexOfAnyValues in FileProviders PathUtils (#85190)

* Use IndexOfAnyValues in FileProviders PathUtils

* Turn two fields into methods

Author: MihaZupan

src/libraries/Microsoft.Extensions.FileProviders.Physical/src/Internal/PathUtils.cs

@@ -1,6 +1,8 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System;
+using System.Buffers;
 using System.IO;
 using System.Linq;
 using Microsoft.Extensions.Primitives;
@@ -9,23 +11,31 @@ namespace Microsoft.Extensions.FileProviders.Physical.Internal
 {
     internal static class PathUtils
     {
-        private static readonly char[] _invalidFileNameChars = Path.GetInvalidFileNameChars()
+        private static char[] GetInvalidFileNameChars() => Path.GetInvalidFileNameChars()
             .Where(c => c != Path.DirectorySeparatorChar && c != Path.AltDirectorySeparatorChar).ToArray();
 
-        private static readonly char[] _invalidFilterChars = _invalidFileNameChars
+        private static char[] GetInvalidFilterChars() => GetInvalidFileNameChars()
             .Where(c => c != '*' && c != '|' && c != '?').ToArray();
 
+#if NET8_0_OR_GREATER
+        private static readonly IndexOfAnyValues<char> _invalidFileNameChars = IndexOfAnyValues.Create(GetInvalidFileNameChars());
+        private static readonly IndexOfAnyValues<char> _invalidFilterChars = IndexOfAnyValues.Create(GetInvalidFilterChars());
+#else
+        private static readonly char[] _invalidFileNameChars = GetInvalidFileNameChars();
+        private static readonly char[] _invalidFilterChars = GetInvalidFilterChars();
+#endif
+
         private static readonly char[] _pathSeparators = new[]
             {Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar};
 
         internal static bool HasInvalidPathChars(string path)
         {
-            return path.IndexOfAny(_invalidFileNameChars) != -1;
+            return path.AsSpan().IndexOfAny(_invalidFileNameChars) >= 0;
         }
 
         internal static bool HasInvalidFilterChars(string path)
         {
-            return path.IndexOfAny(_invalidFilterChars) != -1;
+            return path.AsSpan().IndexOfAny(_invalidFilterChars) >= 0;
         }
 
         internal static string EnsureTrailingSlash(string path)