Explicitly pass ownership of the MemoryBuffer to AddNewSourceBuffer using std::unique_ptr

llvm-svn: 216223
diff --git a/llvm/lib/TableGen/Main.cpp b/llvm/lib/TableGen/Main.cpp
index e317fbf..d9c5601a 100644
--- a/llvm/lib/TableGen/Main.cpp
+++ b/llvm/lib/TableGen/Main.cpp
@@ -88,10 +88,9 @@
            << "': " << EC.message() << "\n";
     return 1;
   }
-  MemoryBuffer *F = FileOrErr.get().release();
 
   // Tell SrcMgr about this buffer, which is what TGParser will pick up.
-  SrcMgr.AddNewSourceBuffer(F, SMLoc());
+  SrcMgr.AddNewSourceBuffer(std::move(*FileOrErr), SMLoc());
 
   // Record the location of the include directory so that the lexer can find
   // it later.