[GHC] #9808: Add data-dir to InstalledPackageInfo

[GHC]

#9808: Add data-dir to InstalledPackageInfo
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              Reporter:  luite       |            Owner:  luite
                  Type:  task        |           Status:  new
              Priority:  normal      |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by luite):

 The required change, that adds the `data-dir` field to
 `InstalledPackageInfo` is now in upstream Cabal, but since I don't have
 commit access to the Cabal submodule repo that GHC is using, I have no
 idea how to make this revision available to `arc diff`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9808#comment:1>
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