[GHC] #15124: Improve block layout for the NCG

[GHC]

#15124: Improve block layout for the NCG
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        Reporter:  AndreasK          |                Owner:  AndreasK
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler (NCG)    |              Version:  8.2.2
      Resolution:                    |             Keywords:  CodeGen
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #8082 #14672      |  Differential Rev(s):  Phab:D4726
       Wiki Page:                    |
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Comment (by AndreasK):

 Ater a bit of tweaking runtime difference is at -0.5%.

 The next step is to verify if this holds up on a different machines as
 well.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15124#comment:6>
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