Consolidate exposed-modules and reexported-modules in InstalledPackageInfo.
A note first: this patch does NOT modify the user-facing experience in Cabal files; it only changes how we register information in the installed package database. This patch takes the exposed-modules and reexported-modules fields in the InstalledPackageInfo structure and consolidates them into just the exposed module fields, which now has a Maybe flag indicating if a module is reexported and, if it is, what the original module was. I've also added in a field for signatures although it is currently unused. The big benefit of this change is that it will make processing at the GHC level much more uniform when we add signatures: signatures can also be reexported and the new representation means we can share the code. Signed-off-by: Edward Z. Yang <firstname.lastname@example.org>
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