[Bug record/31610] Abort when stepping through a restored recording

["brandon.belew at zetier dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31610

--- Comment #1 from Brandon Belew <brandon.belew at zetier dot com> ---
As a follow-up, even on builds that crash with this assertion, I can still
`record goto INSN` to move through the recording history. I hacked up a rf and
rb command (reverse forward and reverse backward) that looks essentially like 

```
set $_r_inst = 1

define rf
record goto $_r_inst + 1
set $_r_inst = $_r_inst + 1
end 

define rb
record goto $_r_inst - 1
set $_r_inst = $_r_inst -1 
end 
```

And this works as a hacky way to step forwards and backwards through the
restored recording without triggering the crash, but this for instance does not
let me do the equivalent of `continue` or `reverse-continue`.

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