[PATCH] [libcxx] Require LLVM in libc++'s CMake.

[Eric Fiselier]

Hi mclow.lists, danalbert, jroelofs,

This patch change the  libc++' standalone build so that it requires LLVM. Previously LLVM was only required to run the test suite. 
libc++ now uses LLVM's CMake modules to handle shared options like `LLVM_USE_SANITIZER` and `LLVM_ENABLE_32_BITS`.

This patch fixes the following bugs:
* PR23670 - https://llvm.org/bugs/show_bug.cgi?id=23670
* PR23671 - https://llvm.org/bugs/show_bug.cgi?id=23671

http://reviews.llvm.org/D10055

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

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