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ghc-prim: levity-polymorphic array equality ops

Closed sheaf requested to merge sheaf/ghc:T22976 into master

This patch changes the pointer-equality comparison operations in GHC.Prim.PtrEq to work with arrays of unlifted values, e.g.

  sameArray# :: forall {l} (a :: TYPE (BoxedRep l)). Array# a -> Array# a -> Int#