fn collect_phi_constant_assign(
function: &FunctionDefinition,
register_assign: &HashMap<RegisterName, RegisterAssign>
) -> HashMap<String, Vec<(RegisterAssign, i64)>>
fn collect_phi_constant_assign(
function: &FunctionDefinition,
register_assign: &HashMap<RegisterName, RegisterAssign>
) -> HashMap<String, Vec<(RegisterAssign, i64)>>