[flang-commits] [flang] [Flang][#212316] Fix -Wunused-template errors under -Werror (PR #218985)

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laoshd wrote:

> @laoshd , before merging could you please rebase and try building again with `-Wunused-template -Werror` ? The other PRs that went in recently may have introduced other changes you may need to address.

Done. No conflict, not new failure.

https://github.com/llvm/llvm-project/pull/218985