GHCi: use real time instead of CPU time for :set -s
GHCi: use real time instead of CPU time for :set -s

CPU time is never very accurate, and it broke completely with
-fexternal-interpreter which runs the interpreted computations in a
separate process.

vTurbine/ghc,olsner/ghc,mettekou/ghc,olsner/ghc,shlevy/ghc,sdiehl/ghc,snoyberg/ghc,olsner/ghc,vikraman/ghc,snoyberg/ghc,mettekou/ghc,vikraman/ghc,ezyang/ghc,sgillespie/ghc,mettekou/ghc,shlevy/ghc,shlevy/ghc,sdiehl/ghc,ezyang/ghc,olsner/ghc,olsner/ghc,snoyberg/ghc,vTurbine/ghc,snoyberg/ghc,vikraman/ghc,shlevy/ghc,sdiehl/ghc,shlevy/ghc,vTurbine/ghc,sgillespie/ghc,sdiehl/ghc,sgillespie/ghc,olsner/ghc,sgillespie/ghc,snoyberg/ghc,vTurbine/ghc,ezyang/ghc,mettekou/ghc,ezyang/ghc,mettekou/ghc,sdiehl/ghc,sdiehl/ghc,ezyang/ghc,snoyberg/ghc,vTurbine/ghc,vikraman/ghc,sgillespie/ghc,mettekou/ghc,shlevy/ghc,vikraman/ghc,snoyberg/ghc,vTurbine/ghc,olsner/ghc,sgillespie/ghc,shlevy/ghc,ezyang/ghc,sdiehl/ghc,vikraman/ghc,sgillespie/ghc,vTurbine/ghc,ezyang/ghc,vikraman/ghc,mettekou/ghc