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

[Eric Fiselier]

I fixed the way that the check-libcxx-symbols rule is generated when no ABI library is passed to CMake on Apple. In this case it passes "libcxxabi" to sym_check as the ABI library.

http://reviews.llvm.org/D4946

Files:
  .gitignore
  CMakeLists.txt
  utils/sym_check/CMakeLists.txt
  utils/sym_check/baseline/clang-libcxxabi-x86_64-apple-darwin13.txt
  utils/sym_check/baseline/clang-libcxxabi-x86_64-linux-gnu.txt
  utils/sym_check/baseline/clang-libcxxrt-x86_64-unknown-freebsd10.txt
  utils/sym_check/baseline/clang-libstdc++-x86_64-linux-gnu.txt
  utils/sym_check/baseline/gcc-libcxxabi-x86_64-linux-gnu.txt
  utils/sym_check/baseline/gcc-libstdc++-x86_64-linux-gnu.txt
  utils/sym_check/sym_check.py
  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
  utils/sym_check/sym_generate_baseline.py
  utils/sym_check/sym_info.py
  www/index.html
  www/sym_check.html
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