Expand I/O CP in comments
Expand I/O CP in comments

as suggested by @gracjan at
https://github.com/ghc/ghc/commit/efc4a1661f0fc1004a4b7b0914f3d3a08c2e791a#commitcomment-20284337

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