add fn to syntax of rustc::ty::maps::define_maps
          #44207
        
          
      
                
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This is not a functional change, it just makes it possible to find a query by grepping without knowing that it's a query rather than a function.
I didn't pursue renaming everything from "map" to "query" because it seems to be a very invasive change. It would be a good test to exercise an IDE's renaming features.
Closes #44161
r? @eddyb