[PATCH] [libcxx] Add numerous options to libc++ LIT test suite configuration.

[Eric Fiselier]

Add support for building and generating code coverage using lcov and genhtml. To produce code coverage you must:

* configure with '-DLIBCXX_GENERATE_COVERAGE=ON'
* `make`
* `make check-libcxx`
* `make check-libcxx-coverage`

The resulting HTML can be found in `<build-libcxx>/test/coverage/libcxx_coverage`

This also adds support for `UNSUPPORTED-XFAIL` and `REQUIRES-XFAIL` tags that ensure compilation fail but report the test as UNSUPPORTED instead of XFAIL.

http://reviews.llvm.org/D5877

Files:
  CMakeLists.txt
  cmake/Modules/LibcxxCodeCoverage.cmake
  lib/CMakeLists.txt
  test/CMakeLists.txt
  test/lit.cfg
  test/lit.site.cfg.in
  www/index.html
  www/lit_usage.html
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