SIMD-0047: Syscall and Sysvar for last restart slot

SIMD-0047 (Syscall and Sysvar for last restart slot) is a Core Standard Solana Improvement Document by Godmode Galactus (Mango Markets); proposal status Activated.

Active on mainnet-beta since epoch 653; active on testnet since epoch 670; active on devnet since epoch 726.

Feature gates

• Feature gate: SIMD-0047: Enable new sysvar last_restart_slot

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