[GHC] #11737: Make validate --testsuite-only behave correctly w.r.t. bindisttest

[GHC]

#11737: Make validate --testsuite-only behave correctly w.r.t. bindisttest
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           Reporter:  goldfire       |             Owner:
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  8.1
           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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 I'm in the process of validating. One of the error messages is a bit
 wrong, so I change the error message code. But the change is more than
 just the phrasing of the message; it's conceivable that a mistake in this
 edit will cause misbehavior, but only on rejected programs. So I determine
 that I don't need to re-run the full validation, but just recompile and
 run the testsuite. I recompile. I say `validate --testsuite-only`. And
 then, after I read the results, I realize that validation uses the bindist
 version of the GHC, which isn't the one that I just built. So have to do
 it all again.

 Thus, request: have `--testsuite-only` not use the bindist version.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11737>
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