LLVM 3.9 released

Version 3.9 of the LLVM compiler suite is out."This release is the result of the LLVM community's work over the pastsix months, including ThinLTO, new libstdc++ ABI compatibility,support for all OpenCL 2.0 and all non-offloading OpenMP 4.5 features,clang-include-fixer, many new clang-tidy checks, significantlyimproved ELF linking with lld, identical code folding and initial LTOsupport in lld, as well as improved optimization, many bug fixes andmore."