Demand: Simplify `CU(U)` to `U` (#19005)
Both sub-demands encode the same information. This is a trivial change and already affects a few regression tests (e.g. `T5075`), so no separate regression test is necessary.
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- compiler/GHC/Core/Opt/DmdAnal.hs 3 additions, 3 deletionscompiler/GHC/Core/Opt/DmdAnal.hs
- compiler/GHC/Types/Demand.hs 37 additions, 25 deletionscompiler/GHC/Types/Demand.hs
- testsuite/tests/arityanal/should_compile/Arity11.stderr 2 additions, 2 deletionstestsuite/tests/arityanal/should_compile/Arity11.stderr
- testsuite/tests/arityanal/should_compile/Arity16.stderr 1 addition, 1 deletiontestsuite/tests/arityanal/should_compile/Arity16.stderr
- testsuite/tests/stranal/should_compile/T18894.stderr 2 additions, 2 deletionstestsuite/tests/stranal/should_compile/T18894.stderr
- testsuite/tests/stranal/sigs/T5075.stderr 2 additions, 2 deletionstestsuite/tests/stranal/sigs/T5075.stderr
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