开启大块内存监控有问题啊，开启不了啊

[RyanQinqhw]

`+ (void)startSingleChunkMallocTracer {
if ([MTHAllocations shared].isLoggingOn)
return;

[[MTHAllocations shared]
    startSingleChunkMallocDetector:[MTHawkeyeUserDefaults shared].chunkMallocThresholdInBytes
                          callback:^(size_t bytes, vm_address_t *_Nonnull stack_frames, size_t frames_count) {
                              MTHLogInfo(@"chunk malloc:%.2fmb stack: ", bytes / 1024 / 1024.f);
                          }];

MTHLogInfo(@"allocations single chunk malloc start");

}`

if ([MTHAllocations shared].isLoggingOn) /// 这块判断有问题，开启了log, 就不能开启大块内存监控