batch_bool kernel `equal` method

[wolfv]

We shoudl do two things:

1. rename equal method to eq so that it matches the regular kernels
2. change the implementation in batch_bool_float kernel to use ! not_equal which is implemented in terms of xor

[JohanMabille]

1. I think the methods name in the regular kernels match the specific part in the name of the intrinsics used for implementation. So if we rename equal into eq we should also rename all the other methods. I don't really see a benefit in doing this, what is important is that batch_bool_kernel<T, N> implementations are consistent together, it does not really matter if they're not consistent with regular kernels. It's even easier for grepping ;)

2. Yep, definitely!

[wolfv]

I agree, functionality wise it won't make a difference -- I just thought it was weird that we have equal vs eq in batch_bool vs batch kernels, and not_equal vs neq. I still think renaming this function so that it matches would be slightly nicer.

[JohanMabille]

Ok, but then let's rename other methods so they also match the intrinsics names!