[GHC] #15019: Fix performance regressions from #14737

[GHC]

#15019: Fix performance regressions from #14737
-------------------------------------+-------------------------------------
        Reporter:  tdammers          |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14737            |  Differential Rev(s):  phab:D4635
       Wiki Page:                    |
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Changes (by tdammers):

 * status:  new => patch
 * differential:  phab:D4568 => phab:D4635


Comment:

 Figured out what went wrong.

 Phab:D4568 was listed in the ticket data, but that one actually belongs to
 #14737, where we fixed the badness in the infamous Grammar.hs (now the
 T13737 test case), and doctored the performance tests to silence the
 resulting regressions. This one has landed.

 The patch that is supposed to close this ticket is Phab:D4635, where we
 fix the regressions introduced earlier. This one hasn't landed, but I
 believe it should ASAP.

 The confusion came from me looking at the status of D4568 earlier today,
 but thinking I was looking at D4635; seeing that the patch had landed, I
 concluded that this should close the ticket as well.

 So, in short: this ticket isn't done yet, but all that's missing is
 landing Phab:D4635.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15019#comment:22>
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