Collect the computed prop dependence data props

@inner
@param {Object} ctx the component instance
@param {string} prop the computed prop name
@param {Function} getter the computed getter
@return {*}
function collectComputedPropDeps(ctx, prop, getter) {
    ctx.__deps = [];
    let value = getter.call(ctx);
    ctx.__computedDeps[prop] = ctx.__deps;
    ctx.__deps = null;

    return value;
}