cmd/compile: use yyerrorl(n.Pos, ...) in typecheckdef

n.Pos.IsKnown() is not needed because it is performed in setlineno.

toolstash-check passed.

Updates #19683.

Change-Id: I34d6a0e6dc9970679d99e8f3424f289ebf1e86ba
Reviewed-on: https://go-review.googlesource.com/114915
Run-TryBot: Yury Smolsky <yury@smolsky.by>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

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

@@ -3640,25 +3640,22 @@ func typecheckdeftype(n *Node) {
 }
 
 func typecheckdef(n *Node) {
-	lno := lineno
-	setlineno(n)
+	lno := setlineno(n)
 
 	if n.Op == ONONAME {
 		if !n.Diag() {
 			n.SetDiag(true)
-			if n.Pos.IsKnown() {
-				lineno = n.Pos
-			}
 
 			// Note: adderrorname looks for this string and
 			// adds context about the outer expression
-			yyerror("undefined: %v", n.Sym)
+			yyerrorl(lineno, "undefined: %v", n.Sym)
 		}
-
+		lineno = lno
 		return
 	}
 
 	if n.Walkdef() == 1 {
+		lineno = lno
 		return
 	}
 
@@ -3701,20 +3698,19 @@ func typecheckdef(n *Node) {
 		e := n.Name.Defn
 		n.Name.Defn = nil
 		if e == nil {
-			lineno = n.Pos
 			Dump("typecheckdef nil defn", n)
-			yyerror("xxx")
+			yyerrorl(n.Pos, "xxx")
 		}
 
 		e = typecheck(e, Erv)
 		if Isconst(e, CTNIL) {
-			yyerror("const initializer cannot be nil")
+			yyerrorl(n.Pos, "const initializer cannot be nil")
 			goto ret
 		}
 
 		if e.Type != nil && e.Op != OLITERAL || !e.isGoConst() {
 			if !e.Diag() {
-				yyerror("const initializer %v is not a constant", e)
+				yyerrorl(n.Pos, "const initializer %v is not a constant", e)
 				e.SetDiag(true)
 			}
 
@@ -3724,12 +3720,12 @@ func typecheckdef(n *Node) {
 		t := n.Type
 		if t != nil {
 			if !okforconst[t.Etype] {
-				yyerror("invalid constant type %v", t)
+				yyerrorl(n.Pos, "invalid constant type %v", t)
 				goto ret
 			}
 
 			if !e.Type.IsUntyped() && !eqtype(t, e.Type) {
-				yyerror("cannot use %L as type %v in const initializer", e, t)
+				yyerrorl(n.Pos, "cannot use %L as type %v in const initializer", e, t)
 				goto ret
 			}