[PATCH] Add -l option to llvm-link and allow linking by resolving symbols

[Stanislav Mekhanoshin]

Changes to llvm-link are really small, most of the code is in the ResolveLinker.cpp. In fact our compiler uses this code for library linking with llvm-link being a secondary tool. Probably other llvm users can use it as well.

http://reviews.llvm.org/D3459