Disallow -XDerivingVia when -XSafe is on (#19786)
Since `GeneralizedNewtypeDeriving` is considered unsafe, `DerivingVia` should be as well.
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- compiler/GHC/Driver/Session.hs 11 additions, 1 deletioncompiler/GHC/Driver/Session.hs
- testsuite/tests/safeHaskell/safeLanguage/SafeLang19.hs 8 additions, 0 deletionstestsuite/tests/safeHaskell/safeLanguage/SafeLang19.hs
- testsuite/tests/safeHaskell/safeLanguage/SafeLang19.stderr 3 additions, 0 deletionstestsuite/tests/safeHaskell/safeLanguage/SafeLang19.stderr
- testsuite/tests/safeHaskell/safeLanguage/all.T 1 addition, 0 deletionstestsuite/tests/safeHaskell/safeLanguage/all.T
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