Remove test_raise_causing_warp_diverge_debug
Remove test_raise_causing_warp_diverge_debug

Following a build farm run (
https://github.com/numba/numba/pull/5144#issuecomment-592052252 )
it appears that this test has divergent behaviour depending on the
platform and CUDA toolkit. It seems that the original suggestion from
Issue #4875, to delete the test, is more appropriate.

sklam/numba,IntelLabs/numba,IntelLabs/numba,numba/numba,gmarkall/numba,sklam/numba,gmarkall/numba,stuartarchibald/numba,stuartarchibald/numba,seibert/numba,stuartarchibald/numba,stuartarchibald/numba,stonebig/numba,stonebig/numba,seibert/numba,stuartarchibald/numba,cpcloud/numba,numba/numba,seibert/numba,stonebig/numba,cpcloud/numba,gmarkall/numba,numba/numba,sklam/numba,IntelLabs/numba,seibert/numba,sklam/numba,IntelLabs/numba,cpcloud/numba,seibert/numba,numba/numba,cpcloud/numba,stonebig/numba,sklam/numba,stonebig/numba,gmarkall/numba,cpcloud/numba,numba/numba,gmarkall/numba,IntelLabs/numba