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

[Eric Fiselier]

Hi danalbert, jroelofs,

This patch allows the use of LIT's ShTest format in the libc++ test suite. It also introduces a series of other changes. These changes are:

- More functionality including parsing test metadata has been moved into LIT.
- LibcxxTestFormat now supports multi-part suffixes.
- the `CXXCompiler` functionality has been used to shrink the size of LibcxxTestFormat. 
- The recursive loading of the site config has been turned into `libcxx.test.config.loadSiteConfig` so it can be used with libc++abi.
- Temporary files are now created in the build directory of libc++. This follows how it is down in ShTest.
- `not.py` was added as a utility executable that mirrors the functionality of LLVM's `not` executable.

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

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