SVE/SVE2 support
Update ASM code to support SVE/SVE2 instruction set for Aarch64 architectures
The aim of this merge request is to improve x264 performance by using SVE/SVE2 instruction set of Aarch64 architectures.
Only the parts of the code whose migration to SVE/SVE2 improves the performance were considered. For the rest, NEON instruction set is still being used.
It should be noted that only the ASM code has been migrated. Not the C/C++ intrinsics.
All unit and regression tests pass.
Edited by David Chen