Tensor UOps can become a buffer or const after scheduling (#8698)

* spec

* work

* update test_viewed_consts_do_not_realize

* remove

test/unit/test_tensor_uop_representation.py

@@ -71,9 +71,9 @@ class TestTensorUopRepresentation(unittest.TestCase):
   def test_viewed_consts_do_not_realize(self):
     a = Tensor.ones(10, 10)
     print(a.lazydata)
-    pre_realize = a.lazydata
     a.realize()
-    assert a.lazydata is pre_realize
+    is_pattern(a, const_pattern)
+    self.assertEqual(a.lazydata.shape, (10, 10))
 
   # currently, CONSTs have a "fake" BUFFER. this should be fixed
   # current: