Fix and test TH pretty-printing of type operator role declarations
This commit fixes and tests `Language.Haskell.TH.Ppr.pprint` so that it correctly pretty-prints `type role` declarations for operator names. Fixes #23954
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- libraries/template-haskell/Language/Haskell/TH/Ppr.hs 1 addition, 1 deletionlibraries/template-haskell/Language/Haskell/TH/Ppr.hs
- testsuite/tests/th/T23954.hs 11 additions, 0 deletionstestsuite/tests/th/T23954.hs
- testsuite/tests/th/T23954.stdout 2 additions, 0 deletionstestsuite/tests/th/T23954.stdout
- testsuite/tests/th/all.T 2 additions, 1 deletiontestsuite/tests/th/all.T
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