SIMD-0683: Pass ABIv1 input metadata via registers r3–r5

SIMD-0683 (Pass ABIv1 input metadata via registers r3–r5) is a Core Standard Solana Improvement Document by febo (Anza); proposal status Review.

Its feature gate is not active on mainnet-beta, testnet and devnet yet.

Feature gates

• Feature gate: SIMD-0683: Pass ABIv1 input metadata via registers r3-r5

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