runtime: add debug call injection support on loong64

runtime: add debug call injection support on loong64

Change-Id: Iaf2bd9da0b35c20c5b57db2eb9b2eea2b662140c
Reviewed-on: https://go-review.googlesource.com/c/go/+/587055
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: abner chenc <chenguoqi@loongson.cn>