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Chandler Carruth
67c6312a79
The `install_paths` library depends on the `llvm_tools` library, which depends on all of LLVM in order to allow _invoking_ the LLVM tools in addition to listing and manipulating them. The `install_paths` also depends on the Clang version number which for some reason depends transitively on a large fraction of LLVM. That should probably be fixed, but we don't actually need it anyways, we can just prune our dependency. Because the digest builder is built in the _exec_ configuration, this was pulling in most of LLVM and Clang to build in the exec configuration as well, adding about 4000 actions or a roughly 30% overhead to complete rebuilds. The time impact is likely closer to 2x because many of the slowest actions are here. Hopefully this makes our bots take much less time when rebuilding.