Function identity_helper_arg 

fn identity_helper_arg<'hir>(
    hir: &'hir Hir<'hir>,
    callee: &'hir Expr<'hir>,
    args: &'hir CallArgs<'hir>,
) -> Option<&'hir Expr<'hir>>

Resolves a bare id(addr) or library-static Lib.id(addr) identity-helper call.