[Timers] TimerGroup: make printJSONValues() method public

[lebedev.ri]

Summary

This is needed for the continuation of D46504,
to be able to store the timings.

[alexfh]

LG

include/llvm/Support/Timer.h

public:
   }
 
   /// Print any started timers in this group and zero them.
   void print(raw_ostream &OS);
 
   /// This static method prints all timers and clears them all out.
   static void printAll(raw_ostream &OS);
 
+  const char *printJSONValues(raw_ostream &OS, const char *delim);
+
   /// Prints all timers as JSON key/value pairs, and clears them all out.
   static const char *printAllJSONValues(raw_ostream &OS, const char *delim);
 
   /// Ensure global timer group lists are initialized. This function is mostly
   /// used by the Statistic code to influence the construction and destruction
   /// order of the global timer lists.
   static void ConstructTimerLists();
 private:
   friend class Timer;
   friend void PrintStatisticsJSON(raw_ostream &OS);
   void addTimer(Timer &T);
   void removeTimer(Timer &T);
   void prepareToPrintList();
   void PrintQueuedTimers(raw_ostream &OS);
   void printJSONValue(raw_ostream &OS, const PrintRecord &R,
                       const char *suffix, double Value);
-  const char *printJSONValues(raw_ostream &OS, const char *delim);
 };
 
 } // end namespace llvm
 
 #endif

lib/Support/Timer.cpp

void TimerGroup::printJSONValue(raw_ostream &OS, const PrintRecord &R,
   assert(yaml::needsQuotes(R.Name) == yaml::QuotingType::None &&
          "Timer name should not need quotes");
   constexpr auto max_digits10 = std::numeric_limits<double>::max_digits10;
   OS << "\t\"time." << Name << '.' << R.Name << suffix
      << "\": " << format("%.*e", max_digits10 - 1, Value);
 }
 
 const char *TimerGroup::printJSONValues(raw_ostream &OS, const char *delim) {
+  sys::SmartScopedLock<true> L(*TimerLock);
+
   prepareToPrintList();
   for (const PrintRecord &R : TimersToPrint) {
     OS << delim;
     delim = ",\n";
 
     const TimeRecord &T = R.Time;
     printJSONValue(OS, R, ".wall", T.getWallTime());
     OS << delim;