[GHC] #13330: forkIO has inconsistent behavior under optimization

[GHC]

#13330: forkIO has inconsistent behavior under optimization
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        Reporter:  dfeuer            |                Owner:  dfeuer
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Core Libraries    |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3189
       Wiki Page:                    |
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Comment (by simonpj):

 In a conversation on Monday I think we agreed:

 * We should try changing `catch#` to be lazy (but still with a `C1(d)`
 usage) and see what perf effect, if any, that has.

 * Neil Mitchell was part of the conversation on #11555; see comment:11
 there.  So let's check with him too.

 I think David is leading on this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13330#comment:7>
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