The updated readme at
http://llvm.org/svn/llvm-project/llgo/trunk/README.TXT mentions the following:
"llgo is under active development. It compiles and passes most of the
standard library test suite and a substantial portion of the gc test suite,
but there are some corner cases that are known not to be handled correctly
yet. Nevertheless it can compile modestly substantial programs (including
itself; it is self hosting on x86-64 Linux)"
so it has come quite a bit farther, it seems.