parse.y: Fix the first location of heredoc identifier

* parse.y (parser_heredoc_identifier):
  Put length of term at the head of rb_strterm_heredoc_struct.term.

* parse.y (rb_parser_set_location_from_strterm_heredoc):
  Use length of term to calculate first_loc.column.

  e.g. The locations of the NODE_DSTR is fixed:

  ```
  a <<STR
  123
  #{:a}
  STR
  ```

  * Before

  ```
  NODE_DSTR (line: 3, code_range: (1,3)-(1,7))
  ```

  * After

  ```
  NODE_DSTR (line: 3, code_range: (1,2)-(1,7))
  ```

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61039 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

0 files changed, 0 insertions, 0 deletions