[issue10785] parser: store the filename as an unicode object

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Version 2 of the patch:
 - remove filename attribute from perrdetail and tok_state structure in PGEN mode, and add a comment to explain why
 - rename filename_obj to filename
 - indenterror() no longer print the input filename in PGEN mode

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Added file: http://bugs.python.org/file20184/parser_filename_obj-2.patch

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