
Summary: This patch adds a timeout of 500ms to death tests. As we add multithreaded code and locks, deadlocks become more likely so timeout will be useful. Additionally: - Better error handling in `invokeSubprocess` - Makes `ProcessStatus`'s methods const Reviewers: sivachandra, MaskRay, gchatelet, PaulkaToast Reviewed By: sivachandra, PaulkaToast Subscribers: tschuett, libc-commits Differential Revision: https://reviews.llvm.org/D75651
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