Bug#863511: numba: segfaults on ppc64el

[Rebecca N. Palmer]

Control: tag -1 - fixed-upstream

Upstream discussion suggests this was fixed ... but then reintroduced in 
the move to LLVM 8:
https://github.com/numba/numba/issues/4026

test_array_reshape is still one of the tests that crashes (but a full 
test run doesn't even get that far because test_typedlist.py crashes 
during collection - see #863507).