Pass enum instead of bool to new linkInModule call in llvm-link

A new call I added to linkInModule from llvm-link in r251866
was still passing in a boolean for an argument that was changed to an
enum in r246561. I didn't catch this in my merge since the bool false
matched the flag value it mapped to.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@251925 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvm-link/llvm-link.cpp

@@ -215,7 +215,7 @@ static bool importFunctions(const char *argv0, LLVMContext &Context,
     }
 
     // Link in the specified function.
-    if (L.linkInModule(M.get(), false, Index.get(), F))
+    if (L.linkInModule(M.get(), Linker::Flags::None, Index.get(), F))
       return false;
   }
   return true;