Merging `massiv` doesn't detect some re-exports

[sgraf812]

After manually fixing the blockers for merging https://github.com/dnlkrgr/hsreduce/files/5688386/repro.zip described in #8, #9 and #10, I finally got to the renamer. Now I get a lot of errors like

AllInOne.hs:6832:11: error:                                                                                                                        
    Not in scope: type constructor or class ‘GHC.Types.~’                                                                                          
    No module named ‘GHC.Types’ is imported.                                                                                                       
     |                                                                                                                                             
6832 |           GHC.Types.~                                                                                                                       
     |           ^^^^^^^^^^^                                                                                                                       

I think ~ is imported through Prelude and there is no import GHC.Types needed to import. The qualification needs to be adjusted accordingly.

Same for

AllInOne.hs:18421:12: error:                                                                                                                       
    Not in scope: ‘Data.Vector.Generic.Base.basicUnsafeThaw’                                                                                       
    Perhaps you meant one of these:                                                                                                                
      ‘Data.Vector.Generic.basicUnsafeThaw’ (imported from Data.Vector.Generic),                                                                   
      ‘Data.Vector.Generic.Mutable.basicUnsafeNew’ (imported from Data.Vector.Generic.Mutable),                                                    
      ‘Data.Vector.Generic.Mutable.basicUnsafeNew’ (imported from Data.Vector.Generic.Mutable)                                                     
    No module named ‘Data.Vector.Generic.Base’ is imported.                                                                                        
      |                                                                                                                                            
18421 |            Data.Vector.Generic.Base.basicUnsafeThaw vec_a17SX)                                                                             
      |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                                        

which is the same issue for D.V.Generic vs. D.V.G.Base.

I thought these kind of issues should be gone now that you use lookupGRE_name? Maybe this comment has to do with that?