Function lookup_int_sym 

pub fn lookup_int_sym(key: SymStr) -> i64

lookup_int variant for hot call sites with a pre-pinned SymStr (see crate::pin!). Skips the per-call arena::pin(key) hash lookup — the sibling of lookup_bool_sym, added for the per-conditional if_count/if_limit probes (Conditional::invoke fires on every \if/\ifx/\ifnum/…).