Fix GetEventsOntypeHierarchy

Same problem as dotnet#552 in properties. Found by accident, but should have done the due dilligence in dotnet#552.

src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/Dataflow/DynamicallyAccessedMembersBinder.cs

@@ -294,7 +294,14 @@ public static IEnumerable<EventPseudoDesc> GetEventsOnTypeHierarchy(this TypeDes
             bool onBaseType = false;
             while (type != null)
             {
-                var ecmaType = (EcmaType)type.GetTypeDefinition();
+                if (type.GetTypeDefinition() is not EcmaType ecmaType)
+                {
+                    // Go down the inheritance chain to see if we have an EcmaType later.
+                    // Arrays would hit this (base type of arrays is the EcmaType for System.Array).
+                    type = type.BaseType;
+                    onBaseType = true;
+                    continue;
+                }
 
                 foreach (var eventHandle in ecmaType.MetadataReader.GetTypeDefinition(ecmaType.Handle).GetEvents())
                 {