I’ve just packaged up LLVM 2.1 for Fedora. It hasn’t hit the testing repository yet, but when it does, you’ll be able to install it in straightforward fashion:
yum --enablerepo=testing install llvm llvm-devel llvm-docs
Until the packages are pushed out (within a few days), you can download them directly.
Are there packages for llvm-gcc too?
Unfortunately, llvm-gcc stubbornly refuses to build.