Fix the Print lifter.

theano/sandbox/gpuarray/opt.py

@@ -451,7 +451,7 @@ def gpu_print_wrapper(op, cnda):
 @op_lifter([tensor.printing.Print])
 def local_gpu_print_op(node, context_name):
     x, = node.inputs
-    gpu_x, = x.owner.inputs
+    gpu_x = as_gpuarray_variable(x, context_name=context_name)
     new_op = node.op.__class__(global_fn=gpu_print_wrapper)
     new_op.old_op = node.op
     return new_op(gpu_x)