override IProfilingBlockInputStream.readSuffixImpl instead of IProfilingBlockInputStream.readSuffix

[SeaRise]

Bug Report

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1. Minimal reproduce step (Required)

void IProfilingBlockInputStream::readSuffix()
{
    auto start_time = info.total_stopwatch.elapsed();
    forEachChild([&] (IBlockInputStream & child)
    {
        child.readSuffix();
        return false;
    });

    readSuffixImpl();
    info.updateExecutionTime(info.total_stopwatch.elapsed() - start_time);
}

2. What did you expect to see? (Required)

3. What did you see instead (Required)

4. What is your TiFlash version? (Required)