Add Avx512 support to IndexOfAnyAsciiSearcher (#103710)

Author: MihaZupan

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

@@ -526,17 +526,17 @@ private static void Test<T>(Random rng, ReadOnlySpan<T> haystackRandom, ReadOnly
 
                 if (expectedIndex != indexOfAnyIndex)
                 {
-                    AssertionFailed(haystack, needle, expectedIndex, indexOfAnyIndex, nameof(indexOfAny));
+                    AssertionFailed(haystack, needle, searchValuesInstance, expectedIndex, indexOfAnyIndex, nameof(indexOfAny));
                 }
 
                 if (expectedIndex != searchValuesIndex)
                 {
-                    AssertionFailed(haystack, needle, expectedIndex, searchValuesIndex, nameof(searchValues));
+                    AssertionFailed(haystack, needle, searchValuesInstance, expectedIndex, searchValuesIndex, nameof(searchValues));
                 }
 
                 if ((expectedIndex >= 0) != searchValuesContainsResult)
                 {
-                    AssertionFailed(haystack, needle, expectedIndex, searchValuesContainsResult ? 0 : -1, nameof(searchValuesContainsResult));
+                    AssertionFailed(haystack, needle, searchValuesInstance, expectedIndex, searchValuesContainsResult ? 0 : -1, nameof(searchValuesContainsResult));
                 }
             }
 
@@ -546,13 +546,16 @@ private static ReadOnlySpan<T> GetRandomSlice<T>(Random rng, ReadOnlySpan<T> spa
                 return slice.Slice(0, Math.Min(slice.Length, rng.Next(maxLength + 1)));
             }
 
-            private static void AssertionFailed<T>(ReadOnlySpan<T> haystack, ReadOnlySpan<T> needle, int expected, int actual, string approach)
+            private static void AssertionFailed<T>(ReadOnlySpan<T> haystack, ReadOnlySpan<T> needle, SearchValues<T> searchValues, int expected, int actual, string approach)
                 where T : INumber<T>
             {
+                Type implType = searchValues.GetType();
+                string impl = $"{implType.Name} [{string.Join(", ", implType.GenericTypeArguments.Select(t => t.Name))}]";
+
                 string readableHaystack = string.Join(", ", haystack.ToArray().Select(c => int.CreateChecked(c)));
                 string readableNeedle = string.Join(", ", needle.ToArray().Select(c => int.CreateChecked(c)));
 
-                Assert.Fail($"Expected {expected}, got {approach}={actual} for needle='{readableNeedle}', haystack='{readableHaystack}'");
+                Assert.Fail($"Expected {expected}, got {approach}={actual} for impl='{impl}', needle='{readableNeedle}', haystack='{readableHaystack}'");
             }
         }
     }