[lld] r266857 - Revert "[ELF] - Avoid using memset for zero-initialization of struct member. NFC."

[George Rimar via llvm-commits]

>I don't think we have any bots that test this configuration unfortunately.
>I've updated my local machine to VS2015 recently (sadly a little too early
>for me to have caught this locally and been able to easily debug it
>locally) and I'm trying to get an internal bot updated too (which is where
>I caught this).
>
>Considering how much time I lost debugging this, I think we should consider
>deprecating VS2013 support at least within LLD.
>
>-- Sean Silva

I am sorry that this change took lot of your time. I was sure it is
clear NFC, but I would not commit it of course if only can knew 
about any possible problems.

George.