Fix handling of buffer with int handle

Author: shwina

cuda_core/cuda/core/experimental/_kernel_arg_handler.pyx

@@ -212,7 +212,13 @@ cdef class ParamHolder:
         for i, arg in enumerate(kernel_args):
             if isinstance(arg, Buffer):
                 # we need the address of where the actual buffer address is stored
-                self.data_addresses[i] = <void*><intptr_t>(arg.handle.getPtr())
+                if isinstance(arg.handle, int):
+                    # see note below on handling int arguments
+                    prepare_arg[intptr_t](self.data, self.data_addresses, arg.handle, i)
+                    continue              
+                else:
+                    # it's a CUdeviceptr:
+                    self.data_addresses[i] = <void*><intptr_t>(arg.handle.getPtr())
                 continue
             elif isinstance(arg, int):
                 # Here's the dilemma: We want to have a fast path to pass in Python