[GHC] #10397: Compiler performance regression 7.6 -> 7.8 in elimCommonBlocks

[GHC]

#10397: Compiler performance regression 7.6 -> 7.8 in elimCommonBlocks
-------------------------------------+-------------------------------------
        Reporter:  TobyGoodwin       |                   Owner:
            Type:  bug               |                  Status:  merge
        Priority:  normal            |               Milestone:  7.10.2
       Component:  Compiler          |                 Version:  7.8.4
      Resolution:  fixed             |                Keywords:
Operating System:  Unknown/Multiple  |  performance
 Type of failure:  None/Unknown      |            Architecture:
      Blocked By:                    |  Unknown/Multiple
 Related Tickets:                    |               Test Case:  see ticket
                                     |                Blocking:
                                     |  Differential Revisions:  Phab:D892
                                     |  Phab:D896
-------------------------------------+-------------------------------------

Comment (by thoughtpolice):

 Joachim, I also picked this last one over to `ghc-7.10`, so these will all
 hit 7.10.2.

 @TobyGoodwin - Unfortunately, we aren't going to be doing any more
 releases of the 7.8.x series at this point, since the branch is quite out
 of date. In theory, all of the current performance fixes Joachim has made
 ''should'' apply to the 7.8 branch still, although there will probably be
 things like conflicts with whitespace and the tabs->spaces conversion that
 happened.

 I'm not sure what the policy is for upstream distributions here is,
 especially if they still aren't even shipping 7.8 to users - and if they
 aren't, can they not use 7.10? I have no clue what timeline most distros
 use for upgrading major versions of things like GHC. Luckily, for Debian,
 Joachim is the maintainer, so I'm sure he'll know the deal. :)

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10397#comment:33>
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