[WIP] update gather_bitmask_kernel to use or remove unused template parameter

[cwharris]

gather_bitmask_kernel isn't using its ignore_out_of_bounds type argument. Removing it.

[jrhemstad]

If it's not being used, then that sounds like a bug that should be fixed, not removed.

[codecov]

Codecov Report

Merging #3444 into branch-0.11 will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           branch-0.11    #3444   +/-   ##
============================================
  Coverage        87.36%   87.36%           
============================================
  Files               49       49           
  Lines             9295     9295           
============================================
  Hits              8121     8121           
  Misses            1174     1174

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[cwharris]

I'll try to prove/disprove a bug exists for this, and go from there.

[jrhemstad]

You can see how it was used in the old gather_bitmask_kernel https://github.com/rapidsai/cudf/blob/branch-0.11/cpp/src/copying/legacy/gather.cuh#L83

[cwharris]

This is closed by #3354.