I did a run on Linux with my clang build scripts without ld.gold, and all LTO tests failed. The macOS and Windows builds were not affected, since they do not use ld.gold.
LLVM has something we call the “gold plugin” for LTO, but that name comes from back when gold was the first linker to support LTO plugins. LTO plugin support has since been added to ld.bfd. Probably we just need to do a bunch of renaming in the documentation and tests.
For now the workaround is to update the build scripts to download binutils-with-gold-2.44.tar.xz, but for future releases it would be great to fix the clang build scripts and update the documentation.