[GHC] #12745: Compile cmm file for register allocator stats

[GHC]

#12745: Compile cmm file for register allocator stats
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        Reporter:  tjakway           |                Owner:  tjakway
            Type:  task              |               Status:  new
        Priority:  lowest            |            Milestone:
       Component:  Compiler (NCG)    |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12744            |  Differential Rev(s):  Phab:D2638
       Wiki Page:                    |
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Comment (by tjakway):

 I've submitted the first patch with a test for avoiding unnecessary spills
 and reloads.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12745#comment:5>
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