[PATCH] [compiler-rt] Make compiler-rt tests work with relocatable SDKs on OS X

[Kuba Brecka]

Another try to solve the issue with compiler-rt unit tests and relocatable SDKs on OS X. This patch adds a check into the build process that:

* before using the just-built clang, tries to compile a single-line `#include <iostream>`
* if that fails, prints out a user-friendly message that they should copy or symlink existing C++ headers into the LLVM output directory

http://reviews.llvm.org/D4047

Files:
  cmake/Modules/CompilerRTCompile.cmake
  lib/sanitizer_common/tests/CMakeLists.txt
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