Raise marshaling exception rather than aborting when marshaling invalid data type as array (case 935726)

Author: joncham

mono/metadata/marshal.c

@@ -1616,9 +1616,11 @@ emit_ptr_to_object_conv (MonoMethodBuilder *mb, MonoType *type, MonoMarshalConv
 		mono_mb_emit_byte (mb, CEE_STIND_REF);
 		break;
 	}
-	case MONO_MARSHAL_CONV_ARRAY_LPARRAY:
-		g_error ("Structure field of type %s can't be marshalled as LPArray", mono_class_from_mono_type (type)->name);
+	case MONO_MARSHAL_CONV_ARRAY_LPARRAY: {
+		char *msg = g_strdup_printf ("Structure field of type %s can't be marshalled as LPArray", mono_class_from_mono_type (type)->name);
+		mono_mb_emit_exception_marshal_directive (mb, msg);
 		break;
+	}
 
 #ifndef DISABLE_COM
 	case MONO_MARSHAL_CONV_OBJECT_INTERFACE: