Add feedback optimizations

Author: Trayan-Zapryanov

src/libraries/System.Web.HttpUtility/src/System/Web/Util/HttpEncoder.cs

@@ -129,7 +129,7 @@ internal static void HtmlEncode(string? value, TextWriter output)
         private static int IndexOfHtmlAttributeEncodingChars(string s) =>
             s.AsSpan().IndexOfAny("<\"'&");
 
-        private static bool IsNonAsciiOrSpaceByte(byte b) => b >= 0x7F || b <= 0x20;
+        private static bool IsNonAsciiOrSpaceByte(byte b) => (uint)b - 0x20 - 1 >= 0x7F - 0x20 - 1;
 
         internal static string JavaScriptStringEncode(string? value)
         {
@@ -565,7 +565,7 @@ private static string UrlPathEncodeImpl(string value)
             }
 
             int indexOfQuery = value.IndexOf('?');
-            if (indexOfQuery >= 0 && indexOfQuery < i)
+            if ((uint)indexOfQuery < (uint)i)
             {
                 // Everything before the Query is valid ASCII
                 return value;

src/libraries/System.Web.HttpUtility/src/System/Web/Util/UriUtil.cs

@@ -40,7 +40,7 @@ internal static bool TrySplitUriForPathEncode(string input, out ReadOnlySpan<cha
                     // To retain the same string as originally given, find the authority in the original url and include
                     // everything up to that.
                     int authorityIndex = inputWithoutQueryFragment.IndexOf(authority, StringComparison.OrdinalIgnoreCase);
-                    if (authorityIndex != -1)
+                    if (authorityIndex >= 0)
                     {
                         int schemeAndAuthorityLength = authorityIndex + authority.Length;
                         schemeAndAuthority = input.AsSpan(0, schemeAndAuthorityLength);