[GHC] #15268: Clarify and test the interaction of -with-rtsopts and -rtsopts flags

[GHC]

#15268: Clarify and test the interaction of -with-rtsopts and -rtsopts flags
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           Reporter:  osa1           |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.5
           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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 Looking at the user manual it's not clear how do `-with-rtsopts` and
 `-rtsopts` flags interact. I'd expect `-with-rtsopts` to work even with
 `-rtsopts=ignoreAll`, but I don't know if this is really the case, and
 because we don't have a way to print RTS flags (see #15261 for this) it's
 hard to make sure this works as expected.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15268>
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