Function rewrite_fixed_load

src/lower2/optimise2.rs:1285–1297

(
    kind: LocalKind,
    old_index: u16,
    slot_map: &BTreeMap<u16, u16>,
    touch: &mut F,
)

        instructions[index + 1] = make_store(store_kind, stored.index);
        // The store moves one instruction later, while the duplicate takes
        // the place of the original load. Keep source scopes and locations
        // attached to those semantic operations, not their old positions.
        metadata.swap(index, index + 1);
    }

    (instructions, metadata)
}

fn fold_iinc_patterns(
    mut instructions: Vec<Instruction>,
    source_locations: Vec<BytecodeMetadata>,
    exception_table: &mut Vec<ExceptionTableEntry>,
) -> jvm::Result<LocatedInstructions> {
    if instructions.len() < 4
        || !instructions
            .windows(4)