gold incremental file format on 64-bit

[Cary Coutant]

>> Tested on x86_64. David, can you test it on Sparc?
>
> Works.

Thanks!

>> +     // Pad the info block to a multiple of 8 bytes.
>> +     if (static_cast<unsigned int>(pov - oview) & 4)
>> +      {
>> +     Swap32::writeval(pov, 0);
>> +     pov += 4;
>> +      }
>
> Maybe this could be indented better :-)

Those two lines are indented by tabs. Looks fine in my editor.

-cary