[GHC] #15002: Panic: collectNBinders

[GHC]

#15002: Panic: collectNBinders
-------------------------------------+-------------------------------------
        Reporter:  crockeea          |                Owner:  nomeata
            Type:  bug               |               Status:  patch
        Priority:  highest           |            Milestone:  8.4.2
       Component:  Profiling         |              Version:  8.4.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4572
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by nomeata):

 Using `noCSE`  was the wrong way of fixing this. I have fixed this bug now
 more properly, less invasively, and with a Note (still at Phab:D4572). The
 solution is to simply use `collectNBinders` when traversing into a join
 point.

 I am fairly confident, so will push if Harbormaster is happy with it, but
 review is of course still appreciated.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15002#comment:14>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler