[PATCH] Add symbol checking script to libc++ to detect ABI changes.

[Eric Fiselier]

More cleanup. Also allow the user to choose between nm and llvm-nm


http://reviews.llvm.org/D4946

Files:
  utils/sym_check/sym_check/__init__.py
  utils/sym_check/sym_check/diff.py
  utils/sym_check/sym_check/extract.py
  utils/sym_check/sym_check/util.py
  utils/sym_check/sym_diff.py
  utils/sym_check/sym_extract.py

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