Commits on Jan 3, 2017
  1. Add `full` option to `ObjectSpace.dump_all`

    The `full` option includes all slots (even `T_NONE`) in the JSON output.
    This is to help with debugging heap fragmentation.
    Here is an example usage:
    ```ruby'heap.json', 'w') do |f|
      ObjectSpace.dump_all(output: f, full: true)
    The `heap.json` file contains all slots, including empty slots.
    [Feature #13001] [ruby-core:78468]
    git-svn-id: svn+ssh:// b2dd03c8-39d4-4d8f-98ff-823fe69b080e
    tenderlove committed Jan 3, 2017