[BUG] lock_xchg insn fail in the bpf_conformance test

[yunwei37]

Describe the bug

Test "./bpf_conformance/tests/lock_xchg.data" failed: Plugin returned incorrect return value 1229782938247303441 expected 0
Test "./bpf_conformance/tests/lock_xchg32.data" failed: Plugin returned incorrect return value 286331153 expected 0

[Officeyutong]

llvm-jit is able to pass these tests in previous version

[yunwei37]

That's interesting...maybe they change the testcases