v2用Valgrind检测PageCache有内存泄漏

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==3007== 39,456 bytes in 1,644 blocks are definitely lost in loss record 6 of 6
==3007== at 0x4846FA3: operator new(unsigned long) (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==3007== by 0x10BD70: Kama_memoryPool::PageCache::allocateSpan(unsigned long) (in /home/tr123/memory_pool/memory-pool-main/v2/build/unit_test)
==3007== by 0x10AC3C: Kama_memoryPool::CentralCache::fetchRange(unsigned long) (in /home/tr123/memory_pool/memory-pool-main/v2/build/unit_test)
==3007== by 0x10BE80: Kama_memoryPool::ThreadCache::fetchFromCentralCache(unsigned long) (in /home/tr123/memory_pool/memory-pool-main/v2/build/unit_test)
==3007== by 0x10D30A: testStress() (in /home/tr123/memory_pool/memory-pool-main/v2/build/unit_test)
==3007== by 0x10A850: main (in /home/tr123/memory_pool/memory-pool-main/v2/build/unit_test)

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应该成员 std::map<size_t, Span*> freeSpans_; std::map<void*, Span*> spanMap_;中Span所指对象未析构换用智能指针自动析构. std::map<size_t, std::shared_ptr> freeSpans_;std::map<void, std::shared_ptr> spanMap_;