[lld] r266304 - Make OutputSectionFactory::lookup() inline. NFC.

[George Rimar via llvm-commits]

>clang warns on it:
>
>Writer.cpp:997:41: warning: missing field 'Alignment' initializer

Ah, ok. MSVS 2015 is fine with it. I`ll change that back.
Not sure how much that warning is correct though, I think it is legal to do.

George.