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Fix a small buglet in tryEtaReduce

Simon Peyton Jones requested to merge wip/T21801 into master

Gergo points out (#21801 (closed)) that GHC.Core.Opt.Arity.tryEtaReduce was making an ill-formed cast. It didn't matter, because the subsequent guard discarded it; but still worth fixing. Spurious warnings are distracting.

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