Forward LastIndexOfAny(Span, ROS) to (ROS, ROS) version

This is consistent with IndexOfAny(Span, ROS)

Author: Rob-Hague

src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs

@@ -1491,18 +1491,8 @@ ref Unsafe.As<T, short>(ref MemoryMarshal.GetReference(span)),
         /// </summary>
         /// <param name="span">The span to search.</param>
         /// <param name="values">The set of values to search for.</param>
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static int LastIndexOfAny<T>(this Span<T> span, ReadOnlySpan<T> values) where T : IEquatable<T>?
-        {
-            if (Unsafe.SizeOf<T>() == sizeof(byte) && RuntimeHelpers.IsBitwiseEquatable<T>())
-                return SpanHelpers.LastIndexOfAny(
-                    ref Unsafe.As<T, byte>(ref MemoryMarshal.GetReference(span)),
-                    span.Length,
-                    ref Unsafe.As<T, byte>(ref MemoryMarshal.GetReference(values)),
-                    values.Length);
-
-            return SpanHelpers.LastIndexOfAny(ref MemoryMarshal.GetReference(span), span.Length, ref MemoryMarshal.GetReference(values), values.Length);
-        }
+            => LastIndexOfAny((ReadOnlySpan<T>)span, values);
 
         /// <summary>
         /// Searches for the last index of any of the specified values similar to calling LastIndexOf several times with the logical OR operator. If not found, returns -1.