Implement ReifyConStrictness for -fexternal-interpreter (#12219)
Implement ReifyConStrictness for -fexternal-interpreter (#12219)

Fixes
   T10697_decided_1.run  T10697_decided_1 [exit code non-0] (ext-interp)
   T10697_decided_2.run  T10697_decided_2 [exit code non-0] (ext-interp)
   T10697_decided_3.run  T10697_decided_3 [exit code non-0] (ext-interp)

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