pprof disasm is not work right after go 1.16

Please answer these questions before submitting your issue. Thanks!

### What version of pprof are you using?

```
yangjie05-mac:awesomeProject35 jie.yang05$ go version
go version go1.17.4 darwin/arm64
```

### What system os and processor architecture are you using?

macos
```
yangjie05-mac:awesomeProject35 jie.yang05$ arch
arm64
```
### What did you do?
I run my code and want to get disasm from the cpuprofile.

code:
```
package main

import (
"math/rand"
"os"
"runtime/pprof"
"time"
)

var global int

func main() {
f, _ := os.Create("cpu.pprof")
pprof.StartCPUProfile(f)
t := time.After(3 * time.Second)
loop:
for {
select {
case <-t:
break loop
default:
global = rand.Int()
}
}
pprof.StopCPUProfile()
f.Sync()
f.Close()
}
```

script:
```
go build -o=bin main.go
./bin
go tool pprof bin cpu.pprof
disasm rand
```

### What did you expect to see?
expect to see (which i run in my macos with same code but go version 1.16)
```
(pprof) disasm rand
Total: 2.67s
ROUTINE ======================== math/rand.(*lockedSource).Int63
450ms 450ms (flat, cum) 16.85% of Total
220ms 220ms 106ce80: MOVQ GS:0x30, CX ;math/rand.(*lockedSource).Int63 rand.go:387
. . 106ce89: CMPQ 0x10(CX), SP ;rand.go:387
. . 106ce8d: JBE 0x106cf90
. . 106ce93: SUBQ $0x20, SP
. . 106ce97: MOVQ BP, 0x18(SP)
. . 106ce9c: LEAQ 0x18(SP), BP
. . 106cea1: XORL AX, AX ;rand.go:388
. . 106cea3: MOVQ 0x28(SP), DX
. . 106cea8: MOVL $0x1, BX
. . 106cead: LOCK CMPXCHGL BX, 0(DX)
60ms 60ms 106ceb1: SETE BL ;math/rand.(*lockedSource).Int63 rand.go:388

```

### What did you see instead?
nothing but total
```
(pprof) disasm rand
Total: 2.63s
(pprof)

```