[dev.regabi] cmd/compile/internal/types: remove Func.Nname

Now that there's no code remaining that uses Func.Nname, we can get
rid of it along with the remaining code that uselessly assigns to it.

Passes toolstash-check.

Change-Id: I104ab3bb5122fb824c741bc6e4d9d54fefe5646e
Reviewed-on: https://go-review.googlesource.com/c/go/+/272390
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>

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

@@ -164,7 +164,6 @@ func importfunc(ipkg *types.Pkg, pos src.XPos, s *types.Sym, t *types.Type) {
 	}
 
 	n.Func = new(Func)
-	t.SetNname(asTypesNode(n))
 
 	if Debug.E != 0 {
 		fmt.Printf("import func %v%S\n", s, t)

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

@@ -221,10 +221,6 @@ func caninl(fn *Node) {
 		Body: inlcopylist(fn.Nbody.Slice()),
 	}
 
-	// hack, TODO, check for better way to link method nodes back to the thing with the ->inl
-	// this is so export can find the body of a method
-	fn.Type.FuncType().Nname = asTypesNode(n)
-
 	if Debug.m > 1 {
 		fmt.Printf("%v: can inline %#v with cost %d as: %#v { %#v }\n", fn.Line(), n, inlineMaxBudget-visitor.budget, fn.Type, asNodes(n.Func.Inl.Body))
 	} else if Debug.m != 0 {

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

@@ -365,13 +365,7 @@ func methodfunc(f *types.Type, receiver *types.Type) *types.Type {
 		out = append(out, d)
 	}
 
-	t := functype(nil, in, out)
-	if f.Nname() != nil {
-		// Link to name of original method function.
-		t.SetNname(f.Nname())
-	}
-
-	return t
+	return functype(nil, in, out)
 }
 
 // methods returns the methods of the non-interface type t, sorted by name.

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

@@ -3409,7 +3409,6 @@ func typecheckfunc(n *Node) {
 		return
 	}
 	n.Type = t
-	t.FuncType().Nname = asTypesNode(n.Func.Nname)
 	rcvr := t.Recv()
 	if rcvr != nil && n.Func.Shortname != nil {
 		m := addmethod(n, n.Func.Shortname, t, true, n.Func.Pragma&Nointerface != 0)

src/cmd/compile/internal/types/sizeof_test.go

@@ -24,7 +24,7 @@ func TestSizeof(t *testing.T) {
 		{Type{}, 52, 88},
 		{Map{}, 20, 40},
 		{Forward{}, 20, 32},
-		{Func{}, 32, 56},
+		{Func{}, 28, 48},
 		{Struct{}, 16, 32},
 		{Interface{}, 8, 16},
 		{Chan{}, 8, 16},

src/cmd/compile/internal/types/type.go

@@ -247,7 +247,6 @@ type Func struct {
 	Results  *Type // function results
 	Params   *Type // function params
 
-	Nname *Node
 	pkg *Pkg
 
 	// Argwid is the total width of the function receiver, params, and results.
@@ -807,26 +806,6 @@ func (t *Type) FuncArgs() *Type {
 	return t.Extra.(FuncArgs).T
 }
 
-// Nname returns the associated function's nname.
-func (t *Type) Nname() *Node {
-	switch t.Etype {
-	case TFUNC:
-		return t.Extra.(*Func).Nname
-	}
-	Fatalf("Type.Nname %v %v", t.Etype, t)
-	return nil
-}
-
-// Nname sets the associated function's nname.
-func (t *Type) SetNname(n *Node) {
-	switch t.Etype {
-	case TFUNC:
-		t.Extra.(*Func).Nname = n
-	default:
-		Fatalf("Type.SetNname %v %v", t.Etype, t)
-	}
-}
-
 // IsFuncArgStruct reports whether t is a struct representing function parameters.
 func (t *Type) IsFuncArgStruct() bool {
 	return t.Etype == TSTRUCT && t.Extra.(*Struct).Funarg != FunargNone