[GHC] #14691: Replace EvTerm with CoreExpr

[GHC]

#14691: Replace EvTerm with CoreExpr
-------------------------------------+-------------------------------------
        Reporter:  nomeata           |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.3
  checker)                           |
      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:                    |
-------------------------------------+-------------------------------------

Comment (by simonpj):

 now the CoreExpr in an EvExpr can no longer refer to an EvTypeable

 Well it can, via `(Var d)` where `d` is the `Id` of the typeable evidence.
 So I think it'll be fine

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14691#comment:22>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler