Causes the dispatcher to drop from 4476 bytes down to 3900 for
SVE-256bit supporting targets.
This is done by significantly reducing SVE loadstore ops. Going from 8
instructions per 4 registers, down to 2 instructions.
This is done by switching from 1 register loadstore instructions up to 4
register loadstore instructions. Which should significantly improve
performance on future SVE platforms.
Filling and Spilling to the context is still using the old code path
because SVE doesn't offer non-interleaving loadstores.
Spilling and filling on the stack is fine because we don't need to match
context state.
Ryan Houdek
40e073c8b2