cmd/compile/internal/gc: remove a Curfn dependency from nod

Change-Id: I5daeb8f00044c86bb10510afbc6886898e61ba15
Reviewed-on: https://go-review.googlesource.com/38570
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

src/cmd/compile/internal/gc/closure.go

@@ -11,6 +11,7 @@ import (
 // function literals aka closures
 func closurehdr(ntype *Node) {
 	n := nod(OCLOSURE, nil, nil)
+	n.Func.SetIsHiddenClosure(Curfn != nil)
 	n.Func.Ntype = ntype
 	n.Func.Depth = funcdepth
 	n.Func.Outerfunc = Curfn
@@ -209,6 +210,7 @@ func makeclosure(func_ *Node) *Node {
 
 	// create the function
 	xfunc := nod(ODCLFUNC, nil, nil)
+	xfunc.Func.SetIsHiddenClosure(Curfn != nil)
 
 	xfunc.Func.Nname = newfuncname(closurename(func_))
 	xfunc.Func.Nname.Sym.SetExported(true) // disable export

src/cmd/compile/internal/gc/subr.go

@@ -342,7 +342,6 @@ func nod(op Op, nleft *Node, nright *Node) *Node {
 		}
 		n = &x.Node
 		n.Func = &x.Func
-		n.Func.SetIsHiddenClosure(Curfn != nil)
 	case ONAME:
 		var x struct {
 			Node