Ada bootstrap broken on x86 and x86_64

[Jan Hubicka]

>     Well, the code is not mine, I just promised to fix bugs while Zdenek
>     is away.  However I am just testing the attached patch.  Does it
>     appear sane?
> 
> Well, the function's description isn't clear enough for me to say for sure,
> but it looks close except that I think the function was expected to return
> NULL_TREE if addr == obj.

I think the other catch is that the function is expected to remove one
wrapper at a time.  I think I will leave this problem to Zdenek unless
it will appear to hit us somehow for now.
Thanks for the explanation
Honza