[PATCH] New options for asan-symbolizer script: set cross-compile prefix, set path to sysroot, print help message

[Maria Guseva]

Thank you for review. I've prepared new patch:
#  Reimplemented command-line parsing part with argparse. Now patterns to be cut are positional arguments for the script. Input file is set by an optional argument with stdin as a default value. Respectively fix_filename() and process_stdin() functions were updated.
# Applied cosmetic fixes suggested in review

http://reviews.llvm.org/D4703

Files:
  lib/asan/scripts/asan_symbolize.py
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