Preserve orientation when unifying kinds
This MR fixes yet another manifestation of the trickiness caused by Note [Fundeps with instances, and equality orientation]. I wish there was a more robust way to do this, but this fix is a definite improvement. Fixes #25597
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- compiler/GHC/Tc/Solver/Equality.hs 12 additions, 10 deletionscompiler/GHC/Tc/Solver/Equality.hs
- compiler/GHC/Tc/Utils/Unify.hs 8 additions, 1 deletioncompiler/GHC/Tc/Utils/Unify.hs
- testsuite/tests/rep-poly/RepPolyMcGuard.stderr 3 additions, 3 deletionstestsuite/tests/rep-poly/RepPolyMcGuard.stderr
- testsuite/tests/rep-poly/RepPolyRecordUpdate.stderr 2 additions, 2 deletionstestsuite/tests/rep-poly/RepPolyRecordUpdate.stderr
- testsuite/tests/rep-poly/T12709.stderr 2 additions, 2 deletionstestsuite/tests/rep-poly/T12709.stderr
- testsuite/tests/typecheck/should_compile/T25597.hs 74 additions, 0 deletionstestsuite/tests/typecheck/should_compile/T25597.hs
- testsuite/tests/typecheck/should_compile/all.T 1 addition, 0 deletionstestsuite/tests/typecheck/should_compile/all.T
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