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remove_message does not store any pointer to x0
On OTP 20 erlang compiler generates following code:
```
{get_tuple_element,{x,0},1,{x,0}}.
remove_message.
```
x0 is clearly still used and it shouldn't be overwritten by
remove_message, also in msg_instrs.tab only loop_rec has
`r(0) = ERL_MESSAGE_TERM(msgp);`.