rL284708 introduces a link error when building with BUILD_SHARED_LIBS:
undefined reference to `llvm::DWARFContext::parseCompileUnits()'
undefined reference to `llvm::DWARFContextInMemory::DWARFContextInMemory(
                            llvm::object::ObjectFile const&,
                            llvm::LoadedObjectInfo const*)'The functions are available in libDebugInfoDWARF, from llvm.