[GHC] #10091: Add configurable verbosity level to hpc executable

[GHC]

#10091: Add configurable verbosity level to hpc executable
-------------------------------------+-------------------------------------
              Reporter:  Yuras       |             Owner:
                  Type:  feature     |            Status:  new
  request                            |         Milestone:
              Priority:  normal      |           Version:  7.8.4
             Component:  Code        |  Operating System:  Unknown/Multiple
  Coverage                           |   Type of failure:  None/Unknown
              Keywords:              |        Blocked By:
          Architecture:              |   Related Tickets:
  Unknown/Multiple                   |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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 Right now `hpc markup` writes a notice for each module and for each index
 file:

 {{{
 Writing: Module.hs.html
 Writing: hpc_index.html
 Writing: hpc_index_fun.html
 Writing: hpc_index_alt.html
 Writing: hpc_index_exp.html
 }}}

 That is a bit annoying when you have e.g. 100 modules.

 I propose to add `--verbosity` flag with possible values `0`, `1` and `2`
 (default `1`) and suppress the notice for verbosity level `0`

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10091>
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