[GHC] #14572: Document for writing GHC-based compiler

[GHC]

#14572: Document for writing GHC-based compiler
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        Reporter:  zaoqi             |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      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 nomeata):

 Does https://github.com/nomeata/veggies serve as an example of writing
 your own Core→LLVM compiler, and resuing GHC for the rest?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14572#comment:3>
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