Disable bogus lint checks about levity polimorphic coerions
Disable bogus lint checks about levity polimorphic coerions

These checks, introduced in cea7141851ce653cb20207da3591d09e73fa396d
hugely inflated build logs, which incapitated perf.haskell.org.

According to Richard, the checks are useless and wrong, and that Ben
plans to investigate.
(https://phabricator.haskell.org/rGHCcea7141851ce653cb20207da3591d09e73fa396d#64647)

Until that happens, I remove them from the code.

sdiehl/ghc,ezyang/ghc,shlevy/ghc,sdiehl/ghc,sdiehl/ghc,ezyang/ghc,sdiehl/ghc,shlevy/ghc,ezyang/ghc,sdiehl/ghc,shlevy/ghc,shlevy/ghc,shlevy/ghc,ezyang/ghc,ezyang/ghc,ezyang/ghc,sdiehl/ghc,shlevy/ghc,sdiehl/ghc,shlevy/ghc,ezyang/ghc