[gfortran] PR15206 RRSPACING wrong for zero

[Tobias Schlüter]

Paul Brook wrote:
>>>On a related issue, the existing rrspacing code to handle denormals is
>>>broken. This occurs when x < TINY(x), ie. expn == 0, frac != 0
>>>I suspect the right shift should be a logical (unsigned) shift, not an
>>>arithmetic (signed) one.
>>
>>Should I close the old bug and add a new one where we keep track of this
>>or should I change the summary line and add this information?
> 
> 
> A new one please.
> 
this is now PR15441.

- Tobi