Fibonacci counter

[0xLucqs]

Description

Compile a sierra fib implementation that returns a counter + the result into an llvm IR file

fn fib(a: felt, b: felt, n: felt) -> (felt, felt) {
    match n {
        0 => (a, 0),
        _ => {
            let (v, count) = fib(b, a + b, n - 1);
            (v, count + 1)
        },
    }
}

Acceptance criteria

• Shenlong should compile the sierra file into an LLVM IR file
• The compiled fib should return the right value

[github-actions]

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[edg-l]

Working on getting this working, fixing the bug #36 helped (i found it trying to do this), but there is now another bug with the return value being the wrong type.