tsan: suport for Go finalizers

llvm-svn: 160723
diff --git a/compiler-rt/lib/tsan/rtl/tsan_clock.h b/compiler-rt/lib/tsan/rtl/tsan_clock.h
index 6911850..c6a8062 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_clock.h
+++ b/compiler-rt/lib/tsan/rtl/tsan_clock.h
@@ -61,6 +61,8 @@
       nclk_ = tid + 1;
   }
 
+  void Disable();
+
   uptr size() const {
     return nclk_;
   }