Function erase

lib/checkleakautovar.h:72–77

    }

    void erase(nonneg int varid) {
        alloctype.erase(varid);
        possibleUsage.erase(varid);
        conditionalAlloc.erase(varid);
        referenced.erase(varid);
    }

    void swap(VarInfo &other) noexcept {
        alloctype.swap(other.alloctype);