[BUG] KeyError: 'attempt to access a non-existent attribute'

[chhzh123]

An error in the buffer generation pass.

import allo
from allo.ir.types import int32

def func(A: int32[8]) -> int32[8]:
    return A

def top(A: int32[8]) -> int32[8]:
    return func(A)

s = allo.customize(top)
print(s.module)
s.build(target="vitis_hls", mode="csim")

This will lead to the following error:

Traceback (most recent call last):
  File "/scratch/users/hc676/allo/test.py", line 12, in <module>
    s.build(target="vitis_hls", mode="csim")
  File "/scratch/users/hc676/allo/allo/customize.py", line 685, in build
    return HLSModule(
           ^^^^^^^^^^
  File "/scratch/users/hc676/allo/allo/backend/hls.py", line 175, in __init__
    buffers = generate_input_output_buffers(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/scratch/users/hc676/allo/allo/passes.py", line 159, in generate_input_output_buffers
    MockBuffer(top_func_name, arg.owner.attributes["name"].value)
                              ~~~~~~~~~~~~~~~~~~~~^^^^^^^^
KeyError: 'attempt to access a non-existent attribute'