Update irbuild-classes.test

Author: BobTheBuidler

mypyc/test-data/irbuild-classes.test

@@ -2708,12 +2708,12 @@ def isinstance_nonnative(x):
     x, r0 :: object
     r1 :: ptr
     r2 :: object
-    r3 :: r2 == r0
-    return r3
+    r3 :: bit
 L0:
     r0 = __main__.NonNative :: type
     r1 = get_element_ptr x ob_type :: PyObject
     r2 :: borrow load_mem r1 :: builtins.object*
+    keep_alive x
     r3 :: r2 == r0
     return r3
 def isinstance_interpreted_subclasses(x):