cmd/compile: make importlist a []*Node instead of *NodeList

Passes go build -a -toolexec 'toolstash -cmp' std.

Change-Id: Ica62765d3c1ef052afed34da1b3ac3f80646cc55
Reviewed-on: https://go-review.googlesource.com/14318Reviewed-by: Dave Cheney <dave@cheney.net>
Run-TryBot: Dave Cheney <dave@cheney.net>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

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

@@ -589,7 +589,7 @@ var externdcl *NodeList
 
 var exportlist []*Node
 
-var importlist *NodeList // imported functions and methods with inlinable bodies
+var importlist []*Node // imported functions and methods with inlinable bodies
 
 var funcsyms *NodeList
 

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

@@ -2038,7 +2038,7 @@ hidden_import:
 		$2.Func.Inl = $3;
 
 		funcbody($2);
-		importlist = list(importlist, $2);
+		importlist = append(importlist, $2);
 
 		if Debug['E'] > 0 {
 			fmt.Printf("import [%q] func %v \n", importpkg.Path, $2)

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

@@ -423,10 +423,10 @@ func Main() {
 	if Debug['l'] > 1 {
 		// Typecheck imported function bodies if debug['l'] > 1,
 		// otherwise lazily when used or re-exported.
-		for l := importlist; l != nil; l = l.Next {
-			if l.N.Func.Inl != nil {
+		for _, n := range importlist {
+			if n.Func.Inl != nil {
 				saveerrors()
-				typecheckinl(l.N)
+				typecheckinl(n)
 			}
 		}
 

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

@@ -3241,7 +3241,7 @@ yydefault:
 			yyDollar[2].node.Func.Inl = yyDollar[3].list
 
 			funcbody(yyDollar[2].node)
-			importlist = list(importlist, yyDollar[2].node)
+			importlist = append(importlist, yyDollar[2].node)
 
 			if Debug['E'] > 0 {
 				fmt.Printf("import [%q] func %v \n", importpkg.Path, yyDollar[2].node)