RFC: WIP: Framework for recording stats for linker phases

[Nick Clifton]

Hi Guys,

  The attached patch is a work in progress that adds the ability to
  record resource usage statistics for various phases of the linker's
  operation.

  The feature is enabled when the --stats command line option is used
  but the data is only emitted if the --Map option is also used.  I
  choose this method as it keeps things simple, instead of adding even
  more command line options.

  I am not sure what phases should be recorded at the moment.  I would
  like to be able to drill down to things like reloc processing and
  string merging, but I am also concerned about how to handle recording
  data when multiple phases are active at the same time.

  Anyway I am posting the code here in case anyone is interested and
  wants to have a look.  If you have any comments or suggestions please
  do let me know.

Cheers
  Nick

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