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Sam McCall authored
Summary: This confusion was inadvertently introduced in a change to the heavyweight_hardware_concurrency API: 8404aeb5 - don't indirect through the rebuilder policy when building the thread pool - document that rebuilder thresholds are exposed for testing only - don't use 0 as a sentinel value for "all threads", as we use it as a sentinel value for "synchronous" (though unsupported for BackgroundIndex) - rather than pick some new sentinel value, just always use 4 threads for tests Reviewers: kadircet, aganea Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, usaxena95, cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D82352
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