[dev.regabi] cmd/compile: remove Name.orig

Passes toolstash -cmp.

Change-Id: Ie563ece7e4da14af46adc660b3d39757eb47c067
Reviewed-on: https://go-review.googlesource.com/c/go/+/280734
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

src/cmd/compile/internal/ir/name.go

@@ -44,8 +44,7 @@ type Name struct {
 	Offset_   int64
 	val       constant.Value
 	Opt       interface{} // for use by escape analysis
-	orig      Node
-	Embed     *[]Embed // list of embedded files, for ONAME var
+	Embed     *[]Embed    // list of embedded files, for ONAME var
 
 	PkgName *PkgName // real package for import . names
 	// For a local variable (not param) or extern, the initializing assignment (OAS or OAS2).
@@ -219,7 +218,6 @@ func newNameAt(pos src.XPos, op Op, sym *types.Sym) *Name {
 	n := new(Name)
 	n.op = op
 	n.pos = pos
-	n.orig = n
 	n.sym = sym
 	return n
 }

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

@@ -21,7 +21,7 @@ func TestSizeof(t *testing.T) {
 		_64bit uintptr     // size on 64bit platforms
 	}{
 		{Func{}, 196, 344},
-		{Name{}, 132, 232},
+		{Name{}, 124, 216},
 	}
 
 	for _, tt := range tests {