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Fix MSVC C4146 in EBPF_OP_NEG64 interpreter handler (#805)

* Fix MSVC C4146 in EBPF_OP_NEG64 interpreter handler

The 64-bit negation handler applied unary minus directly to the
unsigned `reg[inst.dst]` (uint64_t), which MSVC flags as C4146
("unary minus operator applied to unsigned type, result still
unsigned"). Cast to int64_t before negating, mirroring the existing
32-bit EBPF_OP_NEG handler. Behavior is unchanged (two's-complement
negation), but the warning is resolved.

Signed-off-by: Nicholas Ludwig <nludwig@microsoft.com>

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Resolve comment

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Nicholas L <79675390+nmlud21@users.noreply.github.com>

---------

Signed-off-by: Nicholas L <79675390+nmlud21@users.noreply.github.com>
Co-authored-by: Nicholas Ludwig <nludwig@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

1 of 1 new or added line in 1 file covered. (100.0%)

7756 of 9796 relevant lines covered (79.18%)

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