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To prevent crashes during `exit` caused by SR-12668, avoid running static destructors. During testing, we do this by interposing `__cxa_exit` to prevent registration of destructors. This depends on the previous commit that disabled RTLD_DEEPBIND. In the sourcekit-lsp executable, since we control the exit points, we can make a less invasive change to just use `_Exit` instead of `exit` to avoid cleanups. This should hopefully fix the CI issues we have seen when testing with --parallel. rdar://61837752