[GHC] #11487: stg_ap_pp_fast doesn't pass the argument in the arity=1 case

[GHC]

#11487: stg_ap_pp_fast doesn't pass the argument in the arity=1 case
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        Reporter:  rwbarton        |                Owner:
            Type:  bug             |               Status:  new
        Priority:  highest         |            Milestone:  8.0.1
       Component:  Runtime System  |              Version:  8.0.1-rc1
      Resolution:                  |             Keywords:
Operating System:  Linux           |         Architecture:  arm
 Type of failure:  Runtime crash   |            Test Case:
      Blocked By:                  |             Blocking:
 Related Tickets:                  |  Differential Rev(s):
       Wiki Page:                  |
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Comment (by gmainland):

 My recollection is that we were saving too many registers and therefore
 taking a notable performance hit on LLVM. Now we are apparently saving too
 few, but only when saving the current cost centre stack :) If nobody else
 gets to it, I will put a patch on Phab within a week.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11487#comment:6>
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