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Userspace eBPF VM

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https://github.com/iovisor/ubpf/blob/2868ce441b37a816a066bb0d7890107492571ca4/libfuzzer/libfuzz_harness.cc#L118 According to [CPPReference](https://en.cppreference.com/w/cpp/container/vector/data): > If [size()](https://en.cppreference.com/w/cpp/container/vector/size) is ​0​, data() may or may not return a null pointer. That could cause a problem here if there is ever a case...

Tracking issue for: - [ ] https://github.com/iovisor/ubpf/security/code-scanning/20

Tracking issue for: - [ ] https://github.com/iovisor/ubpf/security/code-scanning/21

This pull request introduces support for atomic operations in the disassembler and improves the handling of atomic compare-exchange instructions in the JIT compiler. The most important changes include handling atomic...