runtime: use ABIInternal on syscall and other sys.stuff for loong64

runtime: use ABIInternal on syscall and other sys.stuff for loong64

Change-Id: I6b2942c413eab58c457980131022dace036cd76c
Reviewed-on: https://go-review.googlesource.com/c/go/+/623475
Reviewed-by: Meidan Li <limeidan@loongson.cn>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>