Function execute_job 

fn execute_job<'tcx, C: QueryCache, const FLAGS: QueryFlags, const INCR: bool>(
    query: SemiDynamicQueryDispatcher<'tcx, C, FLAGS>,
    qcx: QueryCtxt<'tcx>,
    state: &'tcx QueryState<'tcx, C::Key>,
    key: C::Key,
    key_hash: u64,
    id: QueryJobId,
    dep_node: Option<DepNode>,
) -> (C::Value, Option<DepNodeIndex>)