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Add "Instantiating" message on instantiation nodes

matthewbauer requested to merge trac-matthewbauer/ghc:backpack-j-with-instantiation-messages into backpack-j

This tells the user what GHC is doing in the last steps where a node is being instantiated. This changes Messager type so that:

-type Messager = HscEnv -> (Int,Int) -> RecompileRequired -> ModSummary -> IO () +type Messager = HscEnv -> (Int,Int) -> RecompileRequired -> WorkGraphNode -> IO ()

and it can handle instantiation nodes as well as work graph nodes. As a result, we are no longer missing a step in the [x of n] messages.

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