iovisor / ubpf / 11262986535

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Fix atomic alu with fetch (#546)

* Handle case where src == R0 in emit_atomic_fetch_alu

Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>

* Fix ubpf dissassembler

Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>

* Reject exchange and compare exchange without fetch flag

Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>

* Use correct __sync operation

Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>

* Revert compare exchange intrinsic change

Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>

* Update disassembler.py

* Update vm/ubpf_vm.c

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

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Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>
Signed-off-by: Alan Jowett <alanjo@microsoft.com>
Co-authored-by: Alan Jowett <alan.jowett@microsoft.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

14 of 25 new or added lines in 2 files covered. (56.0%)

6564 of 8132 relevant lines covered (80.72%)

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