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
diff --git a/test/fixedbugs/bug321.go b/test/fixedbugs/bug321.go
index d0595ff..7d01827 100644
--- a/test/fixedbugs/bug321.go
+++ b/test/fixedbugs/bug321.go
@@ -1,4 +1,4 @@
-// $G $D/$F.go && $L $F.$A && ./$A.out || echo BUG: bug321
+// run
 
 // Copyright 2011 The Go Authors.  All rights reserved.
 // Use of this source code is governed by a BSD-style