SIMD-0685: Loader V3: Remove ExtendProgram

SIMD-0685 (Loader V3: Remove ExtendProgram) is a Solana Improvement Document; proposed in an open pull request.

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

Feature gates

• Feature gate: SIMD-0685: Loader V3 Remove ExtendProgram

Vortex

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