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src/interpreter.rs: Fix arithmetic left/right shift implementation (mask offset)

We mask the mask offset for arithmetic shifts operaitons. The current
version of the BPF Instruction Set Specification specifies that
"Shift operations use a mask of 0x3F (63) for 64-bit operations and
0x1F (31) for 32-bit operations" [0].

[0]: https://www.ietf.org/archive/id/draft-thaler-bpf-isa-02.html#section-3.1-2.2.16.1.1

Signed-off-by: ret2happy <pcy190@126.com>

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