[GHC] #9476: Implement late lambda-lifting

[GHC]

#9476: Implement late lambda-lifting
-------------------------------------+-------------------------------------
        Reporter:  simonpj           |                Owner:  sgraf
            Type:  feature request   |               Status:  closed
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  7.8.2
      Resolution:  fixed             |             Keywords:  LateLamLift
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #8763 #13286      |  Differential Rev(s):  Phab:D5224
       Wiki Page:  LateLamLift       |
-------------------------------------+-------------------------------------

Comment (by sgraf):

 If I omit `-prof`, the RTS yells at me when doing anything other than
 `-hT` or `-h` (what's the difference between these two anyway?).

 The output of `-hT` is not particularly revealing:
 https://pp.ipd.kit.edu/~sgraf/hs/. It's climbing to 80MB for `:` and
 another 100MB for `C`. Interestingly, the maximum residency is higher than
 the baseline, so it seems it's not possible to observe the effects we are
 seeing without `-hT`.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9476#comment:64>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler