unnormal Intel 80-bit long doubles and isnanl

[Florian Weimer]

* Joseph Myers:

> glibc effectively treats them as unspecified behavior - we don't expect 
> them to produce any particular meaningful function return value (this 
> includes the possibility that such an invalid encoding might be returned 
> by a function given such an encoding as input), but if they result in 
> buffer overflows, infinite loops or similar, that's fixed as a bug.

I think the last part (the “bug”) is new.  I welcome a consensus along
those lines.  I just want to highlight this aspect.

Thanks,
Florian
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