cmd/compile: update TestNexting golden file

This change updates the expected output of the gdb debugging session
in the TestNexting internal/ssa test, aligning it with the changes
introduced in CL 134555.

Fixes #27863

Change-Id: I29e747930c7668b429e8936ad230c4d6aa24fdac
Reviewed-on: https://go-review.googlesource.com/137455Reviewed-by: Than McIntosh <thanm@google.com>

src/cmd/compile/internal/ssa/testdata/hist.gdb-opt.nexts

@@ -19,7 +19,7 @@ dy = <Optimized out, as expected>
 65:		if len(os.Args) > 1 {
 73:		scanner := bufio.NewScanner(reader)
 74:		for scanner.Scan() { //gdb-opt=(scanner/A)
-scanner = (struct bufio.Scanner *) <A>
+scanner = (bufio.Scanner *) <A>
 75:			s := scanner.Text()
 76:			i, err := strconv.ParseInt(s, 10, 64)
 77:			if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
@@ -29,7 +29,7 @@ i = 1
 81:			hist = ensure(int(i), hist)
 82:			hist[int(i)]++
 74:		for scanner.Scan() { //gdb-opt=(scanner/A)
-scanner = (struct bufio.Scanner *) <A>
+scanner = (bufio.Scanner *) <A>
 75:			s := scanner.Text()
 76:			i, err := strconv.ParseInt(s, 10, 64)
 77:			if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
@@ -39,7 +39,7 @@ i = 1
 81:			hist = ensure(int(i), hist)
 82:			hist[int(i)]++
 74:		for scanner.Scan() { //gdb-opt=(scanner/A)
-scanner = (struct bufio.Scanner *) <A>
+scanner = (bufio.Scanner *) <A>
 75:			s := scanner.Text()
 76:			i, err := strconv.ParseInt(s, 10, 64)
 77:			if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
@@ -49,7 +49,7 @@ i = 1
 81:			hist = ensure(int(i), hist)
 82:			hist[int(i)]++
 74:		for scanner.Scan() { //gdb-opt=(scanner/A)
-scanner = (struct bufio.Scanner *) <A>
+scanner = (bufio.Scanner *) <A>
 75:			s := scanner.Text()
 76:			i, err := strconv.ParseInt(s, 10, 64)
 77:			if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
@@ -59,7 +59,7 @@ i = 2
 81:			hist = ensure(int(i), hist)
 82:			hist[int(i)]++
 74:		for scanner.Scan() { //gdb-opt=(scanner/A)
-scanner = (struct bufio.Scanner *) <A>
+scanner = (bufio.Scanner *) <A>
 75:			s := scanner.Text()
 76:			i, err := strconv.ParseInt(s, 10, 64)
 77:			if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
@@ -69,7 +69,7 @@ i = 2
 81:			hist = ensure(int(i), hist)
 82:			hist[int(i)]++
 74:		for scanner.Scan() { //gdb-opt=(scanner/A)
-scanner = (struct bufio.Scanner *) <A>
+scanner = (bufio.Scanner *) <A>
 75:			s := scanner.Text()
 76:			i, err := strconv.ParseInt(s, 10, 64)
 77:			if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
@@ -79,7 +79,7 @@ i = 2
 81:			hist = ensure(int(i), hist)
 82:			hist[int(i)]++
 74:		for scanner.Scan() { //gdb-opt=(scanner/A)
-scanner = (struct bufio.Scanner *) <A>
+scanner = (bufio.Scanner *) <A>
 75:			s := scanner.Text()
 76:			i, err := strconv.ParseInt(s, 10, 64)
 77:			if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
@@ -89,7 +89,7 @@ i = 4
 81:			hist = ensure(int(i), hist)
 82:			hist[int(i)]++
 74:		for scanner.Scan() { //gdb-opt=(scanner/A)
-scanner = (struct bufio.Scanner *) <A>
+scanner = (bufio.Scanner *) <A>
 75:			s := scanner.Text()
 76:			i, err := strconv.ParseInt(s, 10, 64)
 77:			if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
@@ -99,7 +99,7 @@ i = 4
 81:			hist = ensure(int(i), hist)
 82:			hist[int(i)]++
 74:		for scanner.Scan() { //gdb-opt=(scanner/A)
-scanner = (struct bufio.Scanner *) <A>
+scanner = (bufio.Scanner *) <A>
 75:			s := scanner.Text()
 76:			i, err := strconv.ParseInt(s, 10, 64)
 77:			if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
@@ -109,7 +109,7 @@ i = 5
 81:			hist = ensure(int(i), hist)
 82:			hist[int(i)]++
 74:		for scanner.Scan() { //gdb-opt=(scanner/A)
-scanner = (struct bufio.Scanner *) <A>
+scanner = (bufio.Scanner *) <A>
 86:		for i, a := range hist {
 87:			if a == 0 { //gdb-opt=(a,n,t)
 a = 0