[GHC] #10320: -ddump-to-file should create empty dump files when there was nothing to dump

[GHC]

#10320: -ddump-to-file should create empty dump files when there was nothing to
dump
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        Reporter:  rwbarton          |                Owner:  tvv
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  7.10.1
      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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Changes (by tvv):

 * owner:   => tvv


Comment:

 I think it's better to keep one but truncate its size. At least it can
 show that flags were specified correctly and there's nothing to dump.

 Seems that `-ddump-rule-rewrites` should be handled too.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10320#comment:4>
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