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Fix strictness in TyCo.Tidy (#14738)

Sylvain Henry requested to merge hsyl20/ghc:hsyl20/perf/tid2 into master

Extracted from !4865 (closed). This MR only fixes strictness (no "go" function, etc.)

Results on CI:

Performance Metrics (test environment: x86_64-linux-deb9-hadrian):

           T12545(normal) ghc/alloc  1850344236.8  1815874472.0  -1.9% GOOD
           T14683(normal) ghc/alloc  3190226088.0  3100413240.0  -2.8% GOOD
           T16577(normal) ghc/alloc 11325541724.8 10834625576.0  -4.3% GOOD
         T5321Fun(normal) ghc/alloc   368011632.0   357647920.0  -2.8% GOOD
            T5642(normal) ghc/alloc   573519816.0   544277912.0  -5.1% GOOD

* All baseline commits are 9cc50a0fce

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