GH-46739: [C++] Fix Float16 signed zero/NaN equality comparisons #46973
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Rationale for this change
Equality comparisons between half-floats (used in their scalar/array
Equalsmethods) do not properly handleEqualOptions::nans_equalandEqualOptions::signed_zeros_equal.What changes are included in this PR?
Are these changes tested?
Yes
Are there any user-facing changes?
No