The free and open source LLVM 3.9 release has been announced for general availability and can now be downloaded.
Highlights of the LLVM 3.9 Release
There are a host of bug fixes and improvements that have made it into the LLVM. There is new libstdc++ ABI compatibility as well as support for all OpenCL 2.0 and all non-offloading OpenMP 4.5 features.
There is improved ELF linking with lld, identical code folding and initial LTO support in lld. There are also many new clang-tidy checks, improved optimization among other changes that can be found here.
You can visit the download page to get yourself the latest copy of this toolkit.