{
    let x := calldataload(1)
    sstore(x, 7)
    sstore(calldataload(0), 7)
    // We can replace this because both values that were
    // written are 7.
    mstore(0, sload(x))
}
// ====
// step: loadResolver
// ----
// {
//     let x := calldataload(1)
//     let _2 := 7
//     sstore(x, _2)
//     let _4 := 0
//     sstore(calldataload(_4), _2)
//     mstore(_4, _2)
// }