| Index: runtime/vm/os_thread_macos.cc
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| diff --git a/runtime/vm/os_thread_macos.cc b/runtime/vm/os_thread_macos.cc
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| index b5fd6f9b8e9948feb8150615f08df3d2129fb57a..53034befa009463ef8116d99f45b02fe49a68136 100644
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| --- a/runtime/vm/os_thread_macos.cc
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| +++ b/runtime/vm/os_thread_macos.cc
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| @@ -163,9 +163,11 @@ ThreadId OSThread::GetCurrentThreadId() {
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|  }
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|  
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|  
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| +#ifndef PRODUCT
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|  ThreadId OSThread::GetCurrentThreadTraceId() {
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|    return ThreadIdFromIntPtr(pthread_mach_thread_np(pthread_self()));
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|  }
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| +#endif  // PRODUCT
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|  
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|  
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|  ThreadJoinId OSThread::GetCurrentThreadJoinId(OSThread* thread) {
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| 
 |