[GHC] #13102: orphan family instances can leak through the EPS in --make mode

[GHC]

#13102: orphan family instances can leak through the EPS in --make mode
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        Reporter:  rwbarton          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ezyang):

 I think rwbarton is probably right; looking at the commit that fixed this
 for instances 4c834fdddf4d44d12039da4d6a2c63a660975b95 it doesn't look
 like I actually added any code for *family instances*. So we need to apply
 an analogous fix there. (I'm not sure what hptInstances is doing but I
 think it is something else?)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13102#comment:2>
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