[GHC] #13426: compile-time memory-usage regression for DynFlags between GHC 8.0 and GHC 8.2

[GHC]

#13426: compile-time memory-usage regression for DynFlags between GHC 8.0 and GHC
8.2
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        Reporter:  hvr               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3399,
       Wiki Page:                    |  Phab:D3400, Phab:D3421
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Comment (by simonpj):

 > would be better to force the types when we take them out of the
 SimplCont and put them into the actual program?

 Yes for the type in the `Stop` continuation; but I think no for the types
 in `ApplyToTy` continuation, which will certainly be used.  I'd force the
 latter on the way in; but the former only on the way out in
 `contResultType`.  Does that make sense?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13426#comment:29>
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