[PATCH] [libcxx] Allow use of ShTest in libc++ tests along with other changes.

[Eric Fiselier]

Modify `not.py` so that it takes `--lit-site=path/to/llvm/utils/lit` as it's first parameter. This allows it to reuse the functionality in `lit.util`.
The `not` substitution now expands to `path/to/python path/to/libcxx/utils/not//not.py --lit-site=path/to/llvm/utils/lit` which is a bit hairy but still do-able.


http://reviews.llvm.org/D7073

Files:
  test/libcxx/compiler.py
  test/libcxx/double_include.sh.cpp
  test/libcxx/test/config.py
  test/libcxx/test/format.py
  test/libcxx/util.py
  test/lit.cfg
  utils/not/not.py
  www/lit_usage.html

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