[vector] Why is it `FloatSpecies.zero()` and `FloatSpecies.broadcast()` but `FloatArray.fromArray()`?

[Brian Goetz]

They are all migrating to XxxVector.  

> On Mar 15, 2019, at 3:50 PM, Lev Serebryakov <lev at serebryakov.spb.ru> wrote:
> 
> 
> I, as early adopter of Vector API, was very surprised by inconsistency
> of fabric methods for vectors.
> 
> Some of these methods are methods of "Spices" (`zero()`, `scalar()`,
> `random()` and `broadcast()`) and some of these methods (all
> `*fromArray()`) are class-methods of "Vector" and takes "Spices" as
> argument.
> 
> Is here any rationale behind this inconsistency?
> 
> -- 
> // Black Lion AKA Lev Serebryakov
>