Minimize uses of lazy initialization by adding explicit initialization functions.

src/log.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 419 matching lines @@
 
 // Process wide registry of samplers.
 class SamplerRegistry : public AllStatic {
  public:
   enum State {
     HAS_NO_SAMPLERS,
     HAS_SAMPLERS,
     HAS_CPU_PROFILING_SAMPLERS
   };
 
+  static void SetUp();
+
   typedef void (*VisitSampler)(Sampler*, void*);
 
   static State GetState();
 
   // Iterates over all active samplers keeping the internal lock held.
   // Returns whether there are any active samplers.
   static bool IterateActiveSamplers(VisitSampler func, void* param);
 
   // Adds/Removes an active sampler.
   static void AddActiveSampler(Sampler* sampler);
@@ skipping 13 matching lines @@
 // Class that extracts stack trace, used for profiling.
 class StackTracer : public AllStatic {
  public:
   static void Trace(Isolate* isolate, TickSample* sample);
 };
 
 } }  // namespace v8::internal
 
 
 #endif  // V8_LOG_H_