SIMD-0173: SBPF instruction encoding improvements

SIMD-0173 (SBPF instruction encoding improvements) is a Core Standard Solana Improvement Document by Alexander Meißner; proposal status Activated.

Active on mainnet-beta since epoch 825; active on testnet since epoch 814; active on devnet since epoch 918.

Feature gates

• Feature gate: SIMD-0173 and SIMD-0174: Enable deployment and execution of SBPFv2 programs

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