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/bug406.go b/test/fixedbugs/bug406.go
index 9d75504..c6f8534 100644
--- a/test/fixedbugs/bug406.go
+++ b/test/fixedbugs/bug406.go
@@ -1,4 +1,4 @@
-// $G $D/$F.go && $L $F.$A && ./$A.out || echo "Bug406"
+// run
 
 // Copyright 2012 The Go Authors.  All rights reserved.
 // Use of this source code is governed by a BSD-style