[GHC] #11565: Restore code to handle '-fmax-worker-args' flag

[GHC]

#11565: Restore code to handle '-fmax-worker-args' flag
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        Reporter:  slyfox            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Description changed by slyfox:

@@ -4,1 +4,1 @@
- It was accidentally lost 3 years ago in major update
+ maxWorkerArgs handling was accidentally lost 3 years ago in major update

New description:

 When i had a pass through DynFlags I've noticed dead code:
     https://phabricator.haskell.org/D1727

 maxWorkerArgs handling was accidentally lost 3 years ago in major update
 changeset:0831a12ea2fc73c33652eeec1adc79fa19700578

 The consensus is to try to put option handling back.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11565#comment:2>
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