[PATCH] [libcxxabi] Add lit configs for libcxxabi tests.

[Dan Albert]

This makes running libcxxabi tests on Linux _much_ easier.
Adds a check-libcxxabi target to cmake.

Also defaults to building a dynamic libc++abi. This is so that the
default options still test the libc++abi that is being built. There are
two problems with testing a static libc++abi. In the case of a
standalone build, the tests will link the system's libc++, which might
not have been built against our libc++abi. In the case of an in tree
build, libc++ will prefer a dynamic libc++abi from the system over a
static libc++abi from the output directory.

http://reviews.llvm.org/D4414

Files:
  CMakeLists.txt
  src/CMakeLists.txt
  test/CMakeLists.txt
  test/lit.cfg
  test/lit.site.cfg.in
  www/index.html
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