patch to canonize unsigned tree-csts

[Richard Sandiford]

Kenneth Zadeck <zadeck@naturalbridge.com> writes:
> On 10/15/2013 02:30 PM, Richard Sandiford wrote:
>> Richard Sandiford <rdsandiford@googlemail.com> writes:
>>>        if (small_prec)
>>>          ;
>>>        else if (precision == xprecision)
>>>          while (len >= 0 && val[len - 1] == -1)
>>>            len--;
>> Err, len > 0 obviously.
> you were only close.

Bah.

> patch tested on ppc and committed as revision 203739.

Thanks.  So that should have got rid of the last use of scratch in
tree->addr_wide_int and tree->max_wide_int.

Richard