[GHC] #15082: Split the TrieMap module into a generic and core specific part.

[GHC]

#15082: Split the TrieMap module into a generic and core specific part.
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           Reporter:  AndreasK       |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):  Phab:D4618     |         Wiki Page:
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 == Split the module into two parts.

 Motivation: I came across a situation where I would have liked to make
 LabelMap a instance of TrieMap.
 However this would create a transitive dependency on CoreSyn for
 essentially all Cmm related Modules which seemed excessive.

 Splitting TrieMap into a general and Core specific part changes this. It
 also leads to a nicer separation of concerns.

 I have implemented a first version of this in D4618.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15082>
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