VectorMask bitwise operations

[Quân Anh Mai]

Hi,

Currently, there is no xor operation for VectorMask, and xnor is called eq,
which seems not consistent with the other logical operations. I also
noticed that each concrete mask type has a xor method. As a result, I
propose adding VectorMask.xor and renaming VectorMask.eq to
VectorMask.xorNot. What do you think?

Thanks a lot,
Quan Anh
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