[GHC] #11717: Way to dump cmm only once

[GHC]

#11717: Way to dump cmm only once
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           Reporter:  nomeata        |             Owner:
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.1
  (CodeGen)                          |
           Keywords:  newcomer       |  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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 The current way to dump Cmm output is `-ddump-cmm`, but that dumps Cmm
 repeatedly, of every stage, similar to `-ddump-verbose-core2core`. This is
 often confusing.

 I propose that `-ddump-cmm` dumps only the initial Cmm code, that the flag
 `-ddump-simpl-cmm` dumps the final Cmm code, and that `-ddump-verbose-cmm`
 dumps every stage.

 Shoudn’t be hard to do for a newcomer.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11717>
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