Add eBPF bswap16/32/64 instruction

[chengshuyi]

Your checklist for this pull request

• [ ] I've documented or updated the documentation of every function and struct this PR changes. If not so I've explained why.
• [x] I've added tests that prove my fix is effective or that my feature works (if possible)

Detailed description

Supports bswap16/32/64 instructions. Different from the le or be instructions, the opcode of bswap is BPF_ALU64.

// copy from: https://docs.kernel.org/bpf/standardization/instruction-set.html
BPF_ALU64 | BPF_TO_LE | BPF_END with imm = 16/32/64 means:

  dst = bswap16(dst)
  dst = bswap32(dst)
  dst = bswap64(dst)

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Test plan

test case in suite/cs_test/issues.cs

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Closing issues

None ...