Performance Improvements: NullOrEmpty check on IEnumerable<T> (#328)

Co-authored-by: Steve Smith <[email protected]>

src/GuardClauses/GuardAgainstNullExtensions.cs

@@ -168,7 +168,12 @@ public static IEnumerable<T> NullOrEmpty<T>(this IGuardClause guardClause,
 #endif
     {
         Guard.Against.Null(input, parameterName, message);
-        if (!input.Any())
+
+        if (input is Array and { Length: 0 } //Try checking first with pattern matching because it's faster than TryGetNonEnumeratedCount on Array
+#if NET6_0_OR_GREATER
+            || (input.TryGetNonEnumeratedCount(out var count) && count == 0)
+#endif
+            || !input.Any())
         {
             throw new ArgumentException(message ?? $"Required input {parameterName} was empty.", parameterName);
         }