Revert D4567233: [Folly] Drop support for Clang < 3.9
-rw-r--r-- 592 .gitignore
drwxr-xr-x - CMake
-rwxr-xr-x 22467 CMakeLists.txt
-rw-r--r-- 10174 LICENSE
-rw-r--r-- 6580 README.md
drwxr-xr-x - folly