Author here. This is really not a useful thing at all (most obviously there's no allocation whatsoever), and it is quite an old version. I pastebin'd it to show to someone on IRC, certainly not to have it show up on the front page of HN :)

Just me tinkering with LLVM, though it will probably turn into something useful (and, ahem, deliberately public) someday... (email of course appreciated if anyone happens to run with it).