[Libre-soc-dev] svp64

[Jacob Lifshay]

I updated the WIP svp64 spec to add an alternative CR register naming
scheme that is more consistent with the integer/fp register naming
scheme. Vectorized instructions would count CRs in SVCR* order, the
initial CR register is TBD but could be CR0 or still CR6. I also added
a spec for how the SV CRs would map to SPR fields.

Also, I responded to some of the things on the svp64 discussion page.

Jacob