[cfe-dev] SemaTemplateInstantiateDecl mistakenly issuing diag::warn_func_template_missing for templated deduction guides

[Mário Feroldi via cfe-dev]

> The post-commit review thread for this warning concluded that this
warning probably shouldn't be on by default, but looks like it didn't get
disabled.

Without -Wundefined-func-template, the warning doesn't come up. But even
when enabled, does it make sense when the template in question is a
deduction guide?
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