Constant solana_rbpf::ebpf::ARSH64_IMM

pub const ARSH64_IMM: u8 = BPF_ALU64 | BPF_K   | BPF_ARSH; // 199u8

BPF opcode: arsh64 dst, imm /// dst >>= imm (arithmetic).

https://en.wikipedia.org/wiki/Arithmetic_shift