[Patch] Fix PR21404 - assertion fail when calculating symbol size

[Senthil Kumar Selvaraj]

Nick Clifton writes:

> Hi Senthil,
>
>   Nice - thanks for looking into this.
>
>>    Ok for trunk and backport to 2_28-branch?
>
> Approved for trunk.  Ping Tristan for the branch.

Tristan, ok to backport this patch to 2.28 branch? 
(https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=b660e9eb7a45cfe99e719c5d16af35913a2fdc96)

Regards
Senthil