runtime: support regABI and add spill functions in runtime for loong64

Update #40724

Co-authored-by: Xiaolin Zhao <[email protected]>
Change-Id: I709b818ef15c33f95251186d749ac13260ad36be
Reviewed-on: https://go-review.googlesource.com/c/go/+/521783
Reviewed-by: David Chase <[email protected]>
Reviewed-by: Meidan Li <[email protected]>
Run-TryBot: David Chase <[email protected]>
Auto-Submit: David Chase <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>

Author: 2 people