test: add liveness test for regabi

With defer/go wrapping and register arguments, some liveness info
changed and live.go test was disabled for regabi. This CL adds a
new one for regabi.

Change-Id: I65f03a6ef156366d8b76c62a16251c3e818f4b02
Reviewed-on: https://go-review.googlesource.com/c/go/+/311369


Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>