Function solana_stake_program::stake_state::calculate_stake_points_and_credits

fn calculate_stake_points_and_credits(
    stake: &Stake,
    new_vote_state: &VoteState,
    stake_history: Option<&StakeHistory>,
    inflation_point_calc_tracer: Option<impl Fn(&InflationPointCalculationEvent)>,
    credits_auto_rewind: bool
) -> CalculatedStakePoints

for a given stake and vote_state, calculate how many points were earned (credits * stake) and new value for credits_observed were the points paid