fix(perf_counter_wrapper): avoid using invalid perf_counters::instance() to remove counter

[zhangyifan27]

The global variable task_spec_profiler *s_spec_profilers could be destroyed after the singleton perf_counters::instance() destroyed,

struct task_spec_profiler
{
    perf_counter_wrapper ptr[PERF_COUNTER_COUNT];
    bool collect_call_count;
    bool is_profile;
    std::atomic<int64_t> *call_counts;

    task_spec_profiler()
    {
        collect_call_count = false;
        is_profile = false;
        call_counts = nullptr;
        memset((void *)ptr, 0, sizeof(ptr));
    }
};

so there would be issues if call perf_counters::instance() in perf_counter_wrapper destructor.

Because it seems not easy to use something else to replace the global variable task_spec_profiler *s_spec_profilers, and make perf_counter_wrapper objects destroyed before perf_counters::instance() destroyed based on current codes, I removed the clear counter operation from perf_counter_wrapper destructor, all counters would be cleared when perf_counters::instance() destroyed.