literal_unroll needs to know about types.Named*Tuple

[stuartarchibald]

Reporting a bug

• I am using the latest released version of Numba (most recent is visible in
  the change log (https://github.com/numba/numba/blob/master/CHANGE_LOG).
• I have included below a minimal working reproducer (if you are unsure how
  to write one see http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports).

This was reported here: https://gitter.im/numba/numba?at=5e57e6a186e6ec2f5c6466a6

from collections import namedtuple
from numba import njit, literal_unroll

ABC = namedtuple('ABC', ['a', 'b', 'c'])

@njit
def unroll(x):
    for z in literal_unroll(x):
        print(z)

abc = ABC(1, 2, 3)
print(unroll(abc))

does this

Invalid use of literal_unroll with a function argument, only tuples are supported as function arguments, found ABC(int64 x 3)

As the Numba internal Python 3.8 tuple __hash__ alg uses literal_unroll, the above issue breaks hashing on named tuples in Python 3.8.