Spurious recompilation in GHCi due to incorrect pruning logic

The pruneCache function assumes that the list of CachedInfo all have unique ModuleName, this is not true:

In normal compilation, the same module name can appear for a file and it's boot file.
In multiple home unit compilation the same ModuleName can appear in different units

The fix is to use a NodeKey as the actual key for the interfaces which includes ModuleName, IsBoot and UnitId.

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