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The official Apt repositories only serve the 3 most recent major versions, while the volunteer-built packages are incomplete and of inconsistent quality, so the best solution is to build LLVM ourselves.
This also reduces the total size for the 6 LLVM caches from 8 GB to around 2.4 GB. That's more than half the limit for a GitHub repository.
lld
is needed for #13193; technically speaking, we could build it straight from the very repository we're cloning here, but we aren't really testing any version-specificlld
behavior, so this patch grabs it from Apt.