Rewrite SamplingCircularQueue

src/cpu-profiler.h

Index: src/cpu-profiler.h
diff --git a/src/cpu-profiler.h b/src/cpu-profiler.h
index 1dd405e5d76a8bd97a083560b4a1283641b7fbc2..3c11e9bf8a5970475b2ec772fd77ea7254739aa8 100644
--- a/src/cpu-profiler.h
+++ b/src/cpu-profiler.h
@@ -156,7 +156,8 @@ class ProfilerEventsProcessor : public Thread {
   // queue (because the structure is of fixed width, but usually not all
   // stack frame entries are filled.) This method returns a pointer to the
   // next record of the buffer.
-  INLINE(TickSample* TickSampleEvent());
+  inline TickSample* StartTickSample();
+  inline void FinishTickSample();
 
  private:
   // Called from events processing thread (Run() method.)
@@ -205,7 +206,8 @@ class CpuProfiler : public CodeEventListener {
   void DeleteProfile(CpuProfile* profile);
 
   // Invoked from stack sampler (thread or signal handler.)
-  TickSample* TickSampleEvent();
+  inline TickSample* StartTickSample();
+  inline void FinishTickSample();
 
   // Must be called via PROFILE macro, otherwise will crash when
   // profiling is not enabled.