Improve char.IsWhiteSpace for non-ASCII (#111569)

Author: MihaZupan

src/libraries/System.Private.CoreLib/src/System/Globalization/CharUnicodeInfo.cs

@@ -443,6 +443,7 @@ private static int GetCodePointFromString(string s, int index)
         /// information is stored. Used for getting the Unicode category, bidi information,
         /// and whitespace information.
         /// </summary>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         private static nuint GetCategoryCasingTableOffsetNoBoundsChecks(uint codePoint)
         {
             UnicodeDebug.AssertIsValidCodePoint(codePoint);