Constant Numerical Scalars may get nonsensical type

[ethancaballero]

e.g.

from myia import myia
import numpy as np
from myia.prim.py_implementations import reshape

@myia
def f(x):
    return reshape(x, (2.1,))

f(np.asarray([[2], [1]]))

AbstractTuple((
    <PendingFromList finished result=UInt[64]> = 2.1
))