powerpc64 switched over in late December; sparc64 never made the switch (unfortunately), and mips will make the switch with the introduction of llvm 10.
IIRC powerpc32 is currently using clang with old bfd ld, but lld in llvm 10 may be quickly reaching the point where it's suitable for powerpc32 as well.
This is specifically w.r.t. FreeBSD -- nobody put in the effort to maintain it, so it's removed in head/ as of now. As far as I'm aware, no one had tested sparc64/llvm on FreeBSD either.
IIRC powerpc32 is currently using clang with old bfd ld, but lld in llvm 10 may be quickly reaching the point where it's suitable for powerpc32 as well.