Basic explicit_s2v:
The verification step was always using round to even when converting a
float to half even for round to zero cores.
Commonfns degrees:
The verification step was only taking into account infinities and not
values that over/underflow. This resulted in an incorrect error
calculation. E.g:
double cpu_result = 175668.85998711039;
cl_half gpu_result = 31743; // this is 65504 when converting to float,
we overflowed.
float error = (cpu_result - gpu_result) * some_factor;
The fix adds the check if( (cl_half) reference == test ) before
calculating the error.
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