[GHC] #10613: Mechanism for checking that we only enter single-entry thunks once

[GHC]

#10613: Mechanism for checking that we only enter single-entry thunks once
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        Reporter:  bgamari           |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"f42db1574935b088cfc13cca7c935990002651dc/ghc"
 f42db157/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="f42db1574935b088cfc13cca7c935990002651dc"
 Remove unused IND_PERM

 it seems that this closure type has not been in use since 5d52d9, so all
 this is dead and untested code. This removes it. Some of the code might
 be useful for a counting indirection as described in #10613, so when
 implementing that, have a look at what this commit removes.

 Test Plan: validate on harbormaster

 Reviewers: austin, bgamari, simonmar

 Reviewed By: simonmar

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D1821
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10613#comment:12>
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