[PATCH][C++] Fix dump-file corruption

[Paolo Bonzini]

>         x x x s2
> get s1  x x s2 s1
> get s2  x x s1 s2
> get s3  x s1 s2 s3

> what am I missing?

This:

            x s2 x x
get s1 ->  s2 x x s1
get s2 ->  s1 x x s2     !!! WRONG, should be x x s1 s2
get s3 ->  x x s2 s3     !!! so that now it is x s1 s2 s3

My apologies if I am wrong.

Paolo