Fix test failure with cuda 11.5 in row_bit_count tests.

[nvdbaranec]

Test code was relying on a quirky (and probably incorrect) compiler behavior where

using LCW   = cudf::test::lists_column_wrapper<T, int>;
lists_column_wrapper<int> col{ LCW{LCW{}} };

would produce a List<List<int>> column with no rows at the top. With cuda 11.5 the order of constructors causes this to create a List<List<int>> column with 1 row at the top. This leaves lists_column_wrapper with no way to currently express "an entirely empty list column nested more than 1 level deep" so the fix for now is just to construct these tests manually.

[codereport]

lgtm 👍

[ttnghia]

Test code was relying on a quirky (and probably incorrect) compiler behavior where

using LCW   = cudf::test::lists_column_wrapper<T, int>;
lists_column_wrapper<int> col{ LCW{LCW{}} };

would produce a List<List<int>> column with no rows at the top. With cuda 11.5 the order of constructors causes this to create a List<List<int>> column with 1 row at the top. This leaves lists_column_wrapper with no way to currently express "an entirely empty list column nested more than 1 level deep" so the fix for now is just to construct these tests manually.

From my experience I had no way to create List<List<int>> with 0 row. col{ LCW{LCW{}} } always create one row containing an empty list.

[codecov]

Codecov Report

Merging #9581 (82cc520) into branch-21.12 (ab4bfaa) will decrease coverage by 0.13%.
The diff coverage is n/a.

❗ Current head 82cc520 differs from pull request most recent head a5d4ea7. Consider uploading reports for the commit a5d4ea7 to get more accurate results

@@               Coverage Diff                @@
##           branch-21.12    #9581      +/-   ##
================================================
- Coverage         10.79%   10.65%   -0.14%     
================================================
  Files               116      117       +1     
  Lines             18869    19743     +874     
================================================
+ Hits               2036     2104      +68     
- Misses            16833    17639     +806     

Impacted Files	Coverage Δ
python/dask_cudf/dask_cudf/sorting.py	92.90% <0.00%> (-1.21%)	⬇️
python/cudf/cudf/io/csv.py	0.00% <0.00%> (ø)
python/cudf/cudf/io/hdf.py	0.00% <0.00%> (ø)
python/cudf/cudf/io/orc.py	0.00% <0.00%> (ø)
python/cudf/cudf/__init__.py	0.00% <0.00%> (ø)
python/cudf/cudf/_version.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/abc.py	0.00% <0.00%> (ø)
python/cudf/cudf/api/types.py	0.00% <0.00%> (ø)
python/cudf/cudf/io/dlpack.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/frame.py	0.00% <0.00%> (ø)
... and 68 more

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[JohnZed]

@gpucibot merge