Add extra test

Author: MihaZupan

src/libraries/System.Memory/tests/Span/StringSearchValues.cs

@@ -5,8 +5,11 @@
 using System.Diagnostics;
 using System.Globalization;
 using System.Linq;
+using System.Runtime.CompilerServices;
 using System.Runtime.ExceptionServices;
 using System.Runtime.InteropServices;
+using System.Runtime.Intrinsics;
+using System.Runtime.Intrinsics.X86;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.DotNet.RemoteExecutor;
@@ -19,6 +22,25 @@ public static class StringSearchValuesTests
         public static bool CanTestInvariantCulture => RemoteExecutor.IsSupported;
         public static bool CanTestNls => RemoteExecutor.IsSupported && OperatingSystem.IsWindows();
 
+        [Fact]
+        public static void SanityCheck()
+        {
+            if (Vector512.IsHardwareAccelerated && Avx512BW.IsSupported)
+            {
+                throw new Exception("Yay?");
+            }
+        }
+
+        [Fact]
+        [MethodImpl(MethodImplOptions.AggressiveOptimization)]
+        public static void SanityCheckAO()
+        {
+            if (Vector512.IsHardwareAccelerated && Avx512BW.IsSupported)
+            {
+                throw new Exception("Yay?");
+            }
+        }
+
         [Theory]
         [InlineData(StringComparison.Ordinal, "a", "ab", "abc", "bc")]
         [InlineData(StringComparison.Ordinal, "A", "ab", "aBc", "Bc")]