Fix llvm::Linker construction for LLVM trunk
Fix llvm::Linker construction for LLVM trunk

surround-io/oclgrind,surround-io/oclgrind,mpflanzer/Oclgrind,surround-io/oclgrind,surround-io/oclgrind,mpflanzer/Oclgrind,mpflanzer/Oclgrind,mpflanzer/Oclgrind