[GHC] #14391: Make the simplifier independent of the typechecker

[GHC]

#14391: Make the simplifier independent of the typechecker
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        Reporter:  nomeata           |                Owner:  ulysses4ever
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:  newcomer
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 ulysses4ever):

 So far I've replaced error-reporting for `TcM` (`notFound`, `failWithTc`)
 with `pprPanic`.

 Now I have full version of `lookupGlobal` in `IO`
 ([https://gist.github.com/ulysses4ever/2b1f3eb7bf0e2779cb1cd30249ec735c
 link]). It doesn't seem to break any test (besides already broken ones).
 Should I submit it to the Phabricator or proceed with the second part
 pointed out by Joachim, `thNameToGhcName`?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14391#comment:14>
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