[dev.cc] cmd/asm: set the flags to production settings (turn off debug)

Set -S to false and add -debug to control the other debugging print.

Change-Id: I864866c3d264a33e6dd0ce12a86a050a5fe0f875
Reviewed-on: https://go-review.googlesource.com/3453
Reviewed-by: Andrew Gerrand <adg@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

src/cmd/asm/main.go

@@ -54,7 +54,7 @@ func main() {
 	var ok bool
 	pList.Firstpc, ok = parser.Parse()
 	if !ok {
-		log.Print("FAIL TODO")
+		log.Fatalf("asm: assembly of %s failed", flag.Arg(0))
 		os.Exit(1)
 	}
 	obj.Writeobjdirect(ctxt, output)