[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
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 When i had a pass through DynFlags I've noticed dead code:
     https://phabricator.haskell.org/D1727

 It 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>
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