[dev.garbage] code review 169120043: cmd/gc, runtime: add locks around print statements

test/live2.go

 // errorcheck -0 -live -wb=0
 
 // Copyright 2014 The Go Authors.  All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 // liveness tests with inlining ENABLED
 // see also live.go.
 
 package main
 
 // issue 8142: lost 'addrtaken' bit on inlined variables.
 // no inlining in this test, so just checking that non-inlined works.
 
+func printnl()
+
 type T40 struct {
         m map[int]int
 }
 
 func newT40() *T40 {
         ret := T40{}
         ret.m = make(map[int]int) // ERROR "live at call to makemap: &ret"
         return &ret
 }
 
 func bad40() {
         t := newT40() // ERROR "live at call to makemap: ret"
-        println()     // ERROR "live at call to printnl: ret"
+        printnl()     // ERROR "live at call to printnl: ret"
         _ = t
 }
 
 func good40() {
         ret := T40{}
         ret.m = make(map[int]int) // ERROR "live at call to makemap: ret"
         t := &ret
-        println() // ERROR "live at call to printnl: ret"
+        printnl() // ERROR "live at call to printnl: ret"
         _ = t
 }