[fedora-arm] llvm/clang support

Did anyone ever get llvm/clang working? It -says- it is fast, good optimization, faster binaries, aimed at generating better errors, and has good tools for debugging. :) the darwin-arm (and x86 ports are production quality. There isn't support for EABI or < armv6 in the ARM-backend yet. But it sounds like it might be a lot more wicked at catching bugs.