Function swap

lib/checkleakautovar.h:79–84

    }

    void swap(VarInfo &other) noexcept {
        alloctype.swap(other.alloctype);
        possibleUsage.swap(other.possibleUsage);
        conditionalAlloc.swap(other.conditionalAlloc);
        referenced.swap(other.referenced);
    }

    void reallocToAlloc(nonneg int varid) {
        const AllocInfo& alloc = alloctype[varid];