easylogging++: faster access to logging

Turns out getting the global shared_ptr hits the profile,
and passing it around still keeps it at close to ~1% CPU,
which is too much for mostly silent logging.

Leak the object instead, which is even safer for late logging.

contrib/valgrind/monero.supp

@@ -17,3 +17,12 @@
    fun:maybe_unlock_and_signal_one<boost::asio::detail::scoped_lock<boost::asio::detail::posix_mutex> >
    ...
 }
+
+{
+   we leak the logger, for performance reasons in on-the-fly init
+   Memcheck:Leak
+   match-leak-kinds: definite
+   fun:_Znwm
+   fun:_ZN2el4base7Storage7getELPPEv
+   ...
+}

external/easylogging++/easylogging++.cc

@@ -2191,6 +2191,12 @@ void VRegistry::setFromArgs(const base::utils::CommandLineArgs* commandLineArgs)
 #   define ELPP_DEFAULT_LOGGING_FLAGS 0x0
 #endif // !defined(ELPP_DEFAULT_LOGGING_FLAGS)
 // Storage
+el::base::type::StoragePointer &el::base::Storage::getELPP()
+{
+  if (!el::base::elStorage)
+    el::base::elStorage = new el::base::Storage(el::LogBuilderPtr(new el::base::DefaultLogBuilder()));
+  return el::base::elStorage;
+}
 #if ELPP_ASYNC_LOGGING
 Storage::Storage(const LogBuilderPtr& defaultLogBuilder, base::IWorker* asyncDispatchWorker) :
 #else

external/easylogging++/easylogging++.h

@@ -552,7 +552,7 @@ typedef std::ostream ostream_t;
 typedef unsigned int EnumType;
 typedef unsigned short VerboseLevel;
 typedef unsigned long int LineNumber;
-typedef std::shared_ptr<base::Storage> StoragePointer;
+typedef base::Storage *StoragePointer;
 typedef std::shared_ptr<LogDispatchCallback> LogDispatchCallbackPtr;
 typedef std::shared_ptr<PerformanceTrackingCallback> PerformanceTrackingCallbackPtr;
 typedef std::shared_ptr<LoggerRegistrationCallback> LoggerRegistrationCallbackPtr;
@@ -2734,6 +2734,8 @@ class Storage : base::NoCopy, public base::threading::ThreadSafe {
     return it->second;
   }
 
+  static el::base::type::StoragePointer &getELPP();
+
  private:
   base::RegisteredHitCounters* m_registeredHitCounters;
   base::RegisteredLoggers* m_registeredLoggers;
@@ -2768,7 +2770,7 @@ class Storage : base::NoCopy, public base::threading::ThreadSafe {
   }
 };
 extern ELPP_EXPORT base::type::StoragePointer elStorage;
-#define ELPP el::base::elStorage
+#define ELPP el::base::Storage::getELPP()
 class DefaultLogDispatchCallback : public LogDispatchCallback {
  protected:
   void handle(const LogDispatchData* data);