[Ada] Lock-free implementation of protected objects

[Arnaud Charlet]

> Hi Arnaud,

You removed Vincent who is the author of this patch, included here.

>> --- s-atopri.adb	(revision 189768)
>> +++ s-atopri.adb	(working copy)
>> @@ -31,6 +31,58 @@
>> 
>>  package body System.Atomic_Primitives is
>> 
>> +   ----------------------
>> +   -- Lock_Free_Read_8 --
>> +   ----------------------
> 
> ...
> 
>> +   ----------------------
>> +   -- Lock_Free_Read_16 --
>> +   ----------------------
> 
> ...
> 
>> +   ----------------------
>> +   -- Lock_Free_Read_32 --
>> +   ----------------------
> 
> There's a bunch or wrong comment formatting (notice how "----" lines aren't
> always long enough except for the _8 case).