gen-arm: add sve intrinsic definitions

Thousands of lines of SVE intrinsic definitions..

Co-authored-by: Jamie Cunliffe <Jamie.Cunliffe@arm.com>
Co-authored-by: Luca Vizzarro <Luca.Vizzarro@arm.com>
Co-authored-by: Adam Gemmell <adam.gemmell@arm.com>
Co-authored-by: Jacob Bramley <jacob.bramley@arm.com>

Author: 5 people