[GHC] #15924: Do not save performance test results if worktree is dirty

[GHC]

#15924: Do not save performance test results if worktree is dirty
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        Reporter:  davide            |                Owner:  davide
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.3
       Component:  Test Suite        |              Version:  8.6.2
      Resolution:                    |             Keywords:  performance
                                     |  tests git notes
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  12758             |  Differential Rev(s):  D5368
       Wiki Page:                    |
  Performance/Tests                  |
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Comment (by osa1):

 Are we currently generating these notes in the committer's system? What
 happens if I commit without running perf tests? What happens if my
 computer is too slow or fast and generates deviated numbers?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15924#comment:3>
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