[Mono.Debugging.Evaluation] Make sure that array element groups do not exceed the length of the array

Fixes https://bugzilla.xamarin.com/show_bug.cgi?id=47083

Author: jstedfast

Mono.Debugging/Mono.Debugging.Evaluation/ArrayElementGroup.cs

@@ -226,7 +226,7 @@ public ObjectValue[] GetChildren (ObjectPath path, int firstItemIndex, int count
 				var list = new List<ObjectValue> ();
 				while (i < len) {
 					int end = i + div - 1;
-					if (end > len)
+					if (end >= len)
 						end = len - 1;
 					ArrayElementGroup grp = new ArrayElementGroup (cctx, array, baseIndices, i, end);
 					list.Add (grp.CreateObjectValue ());