cmd/compile: more lineno type conversions

Change-Id: Ib0a116a78f61eafe88a0ea5dc6733750ae755fdf
Reviewed-on: https://go-review.googlesource.com/20156
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

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

@@ -125,7 +125,7 @@ func dowidth(t *Type) {
 	if t.Width == -2 {
 		if !t.Broke {
 			t.Broke = true
-			yyerrorl(int32(t.Lineno), "invalid recursive type %v", t)
+			yyerrorl(t.Lineno, "invalid recursive type %v", t)
 		}
 
 		t.Width = 0
@@ -142,7 +142,7 @@ func dowidth(t *Type) {
 	defercalc++
 
 	lno := lineno
-	lineno = int32(t.Lineno)
+	lineno = t.Lineno
 	t.Width = -2
 	t.Align = 0
 

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

@@ -104,7 +104,7 @@ type Type struct {
 
 	Nod    *Node // canonical OTYPE node
 	Orig   *Type // original type (type literal or predefined type)
-	Lineno int
+	Lineno int32
 
 	// TFUNC
 	Thistuple int

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

@@ -391,7 +391,7 @@ func typ(et EType) *Type {
 	t := new(Type)
 	t.Etype = et
 	t.Width = BADWIDTH
-	t.Lineno = int(lineno)
+	t.Lineno = lineno
 	t.Orig = t
 	return t
 }