Fix orc reader assert on create data_type in debug

[davidwendt]

The fix from #8174 got reverted in rework of orc/reader_impl.cu in #8599
This PR reinstates the original fix to prevent an assert in debug mode in gtests/ORC_TEST

[codecov]

Codecov Report

Merging #8706 (0e5531c) into branch-21.08 (ecbec81) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

❗ Current head 0e5531c differs from pull request most recent head ea5771d. Consider uploading reports for the commit ea5771d to get more accurate results

@@               Coverage Diff                @@
##           branch-21.08    #8706      +/-   ##
================================================
- Coverage         10.62%   10.61%   -0.01%     
================================================
  Files               109      109              
  Lines             18291    18300       +9     
================================================
  Hits               1943     1943              
- Misses            16348    16357       +9     

Impacted Files	Coverage Δ
python/cudf/cudf/core/scalar.py	0.00% <0.00%> (ø)

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[codereport]

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[codereport]

@gpucibot merge