[dev.regabi] cmd/compile: use LinksymOffsetExpr in TypePtr/ItabAddr

Passes toolstash -cmp.

Fixes #43737

Change-Id: I2d5228c0213b5f8742e3cea6fac9bc985b19d78c
Reviewed-on: https://go-review.googlesource.com/c/go/+/284122
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

src/cmd/compile/internal/reflectdata/reflect.go

@@ -836,39 +836,22 @@ func TypeLinksym(t *types.Type) *obj.LSym {
 }
 
 func TypePtr(t *types.Type) *ir.AddrExpr {
-	s := TypeSym(t)
-	if s.Def == nil {
-		n := ir.NewNameAt(src.NoXPos, s)
-		n.SetType(types.Types[types.TUINT8])
-		n.Class = ir.PEXTERN
-		n.SetTypecheck(1)
-		s.Def = n
-	}
-
-	n := typecheck.NodAddr(ir.AsNode(s.Def))
-	n.SetType(types.NewPtr(s.Def.Type()))
-	n.SetTypecheck(1)
-	return n
+	n := ir.NewLinksymExpr(base.Pos, TypeLinksym(t), types.Types[types.TUINT8])
+	return typecheck.Expr(typecheck.NodAddr(n)).(*ir.AddrExpr)
 }
 
 func ITabAddr(t, itype *types.Type) *ir.AddrExpr {
 	if t == nil || (t.IsPtr() && t.Elem() == nil) || t.IsUntyped() || !itype.IsInterface() || itype.IsEmptyInterface() {
 		base.Fatalf("ITabAddr(%v, %v)", t, itype)
 	}
-	s := ir.Pkgs.Itab.Lookup(t.ShortString() + "," + itype.ShortString())
-	if s.Def == nil {
-		n := typecheck.NewName(s)
-		n.SetType(types.Types[types.TUINT8])
-		n.Class = ir.PEXTERN
-		n.SetTypecheck(1)
-		s.Def = n
-		itabs = append(itabs, itabEntry{t: t, itype: itype, lsym: n.Linksym()})
+	s, existed := ir.Pkgs.Itab.LookupOK(t.ShortString() + "," + itype.ShortString())
+	if !existed {
+		itabs = append(itabs, itabEntry{t: t, itype: itype, lsym: s.Linksym()})
 	}
 
-	n := typecheck.NodAddr(ir.AsNode(s.Def))
-	n.SetType(types.NewPtr(s.Def.Type()))
-	n.SetTypecheck(1)
-	return n
+	lsym := s.Linksym()
+	n := ir.NewLinksymExpr(base.Pos, lsym, types.Types[types.TUINT8])
+	return typecheck.Expr(typecheck.NodAddr(n)).(*ir.AddrExpr)
 }
 
 // needkeyupdate reports whether map updates with t as a key

src/cmd/compile/internal/staticinit/sched.go

@@ -344,7 +344,7 @@ func (s *Schedule) StaticAssign(l *ir.Name, loff int64, r ir.Node, typ *types.Ty
 		// Create a copy of l to modify while we emit data.
 
 		// Emit itab, advance offset.
-		staticdata.InitAddr(l, loff, itab.X.(*ir.Name).Linksym())
+		staticdata.InitAddr(l, loff, itab.X.(*ir.LinksymOffsetExpr).Linksym)
 
 		// Emit data.
 		if types.IsDirectIface(val.Type()) {