testsuite: Un-break T5642
testsuite: Un-break T5642

This was largely fixed by the re-rework of the pattern match checker.
Resolves #5642.

shlevy/ghc,mettekou/ghc,vikraman/ghc,mcschroeder/ghc,mcschroeder/ghc,mettekou/ghc,mettekou/ghc,snoyberg/ghc,vTurbine/ghc,tjakway/ghcjvm,vTurbine/ghc,olsner/ghc,tjakway/ghcjvm,snoyberg/ghc,sdiehl/ghc,mettekou/ghc,oldmanmike/ghc,mettekou/ghc,mcschroeder/ghc,olsner/ghc,sgillespie/ghc,olsner/ghc,vTurbine/ghc,tjakway/ghcjvm,sgillespie/ghc,shlevy/ghc,olsner/ghc,shlevy/ghc,sdiehl/ghc,snoyberg/ghc,ezyang/ghc,ezyang/ghc,olsner/ghc,tjakway/ghcjvm,vikraman/ghc,vTurbine/ghc,ezyang/ghc,shlevy/ghc,sgillespie/ghc,mcschroeder/ghc,ezyang/ghc,vikraman/ghc,oldmanmike/ghc,snoyberg/ghc,vikraman/ghc,tjakway/ghcjvm,tjakway/ghcjvm,tjakway/ghcjvm,vikraman/ghc,vTurbine/ghc,ezyang/ghc,oldmanmike/ghc,oldmanmike/ghc,sgillespie/ghc,olsner/ghc,snoyberg/ghc,shlevy/ghc,oldmanmike/ghc,mcschroeder/ghc,sdiehl/ghc,sdiehl/ghc,olsner/ghc,vikraman/ghc,mcschroeder/ghc,ezyang/ghc,sdiehl/ghc,sgillespie/ghc,sdiehl/ghc,oldmanmike/ghc,mettekou/ghc,sgillespie/ghc,snoyberg/ghc,oldmanmike/ghc,shlevy/ghc,mcschroeder/ghc,sgillespie/ghc,mettekou/ghc,snoyberg/ghc,vTurbine/ghc,sdiehl/ghc,ezyang/ghc,shlevy/ghc,vTurbine/ghc,vikraman/ghc