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Add LLD to slow builder sanitizer bot.

Authored by hctim on Nov 6 2019, 4:33 PM.

Description

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.

Details