SuccessChanges

Summary

  1. Add LLD to slow builder sanitizer bot. (details)
Commit 7b38316441a50c2a3f48cd3e5691c85b7234085f by 31459023+hctim
Add LLD to slow builder sanitizer bot.
Bots started spuriously failing this morning because the gcc-built
bootstrap clang then is used to check-*san. Some of the check-*san
suites (like check-hwasan) use -fuse-ld=lld in their lit config, and we
didn't build LLD.
Fix this by building LLD when we build the bootstrap clang.
The file was modifiedzorg/buildbot/builders/sanitizers/buildbot_cmake.sh