Ensure that the two offsets of a dynamic_slice have the same dtype re…

…gardless

the value of config.enable_x64.

PiperOrigin-RevId: 708031525

tests/pjit_test.py

@@ -1347,8 +1347,10 @@ def partition(precision, mesh, arg_shapes, result_shape):
       def lower_fn(x, y):
         axis_name = arg_shardings[1].spec[0][0]
         i = jax.lax.axis_index(axis_name)
+        # Use offset i * 0 instead of 0 to ensure that the two offsets have the
+        # same dtype regardless the value of config.enable_x64.
         z = jax.lax.psum(
-            jax.lax.dynamic_slice(x, (0, i * 8), (8, 8)) @ y, (axis_name)
+            jax.lax.dynamic_slice(x, (i * 0, i * 8), (8, 8)) @ y, (axis_name)
         )
         return z, z * z