test: use testlib (another bunch).

Apply sed with:

1s,^// $G $D/$F.go && $L $F.$A && ./$A.out || echo.*,// run,
1s,^// $G $D/$F.go || echo.*,// compile,

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5656099

test/fixedbugs/bug174.go

@@ -1,4 +1,4 @@
-// $G $D/$F.go || echo BUG: bug174
+// compile
 
 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style