Clang should not warn on code in clang that is only there to remove warnings.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@122941 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Rewrite/TokenRewriter.cpp

@@ -73,7 +73,7 @@ TokenRewriter::AddToken(const Token &T, TokenRefTy Where) {
   bool InsertSuccess = TokenAtLoc.insert(std::make_pair(T.getLocation(),
                                                         Where)).second;
   assert(InsertSuccess && "Token location already in rewriter!");
-  InsertSuccess = InsertSuccess;
+  (void)InsertSuccess;
   return Where;
 }