[GHC] #13779: Add more signature suppression control for dumps

[GHC]

#13779: Add more signature suppression control for dumps
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           Reporter:  dfeuer         |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:  8.4.1
          Component:  Compiler       |           Version:  8.2.1-rc2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I tend to find some type signatures essential when reading Core. However,
 `Generic`-heavy code can produce extremely large signatures. I suspect one
 or both of the following additional options could help:

 1. An option to suppress non-top-level signatures, leaving top-level ones
 alone.

 2. An option to suppress phantom type arguments in signatures.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13779>
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