[BOLT][NFC] Move out ReorderFunctions::printStats

[Amir]

Summary

Break out stats-printing code from ReorderFunctions::reorder for brevity.

[maksfb]

LGTM

bolt/include/bolt/Passes/ReorderFunctions.h

 
 /// Modify function order for streaming based on hotness.
 class ReorderFunctions : public BinaryFunctionPass {
   BinaryFunctionCallGraph Cg;
 
   void reorder(std::vector<Cluster> &&Clusters,
                std::map<uint64_t, BinaryFunction> &BFs);
 
+  void printStats(const std::vector<Cluster> &Clusters,
+                  const std::vector<uint64_t> &FuncAddr);
+
 public:
   enum ReorderType : char {
     RT_NONE = 0,
     RT_EXEC_COUNT,
     RT_HFSORT,
     RT_HFSORT_PLUS,
     RT_PETTIS_HANSEN,
     RT_RANDOM,

bolt/lib/Passes/ReorderFunctions.cpp

for (auto &It : BFs) {
     BinaryFunction &BF = It.second;
     if (!BF.hasValidIndex() && BF.hasValidProfile())
       BF.setIndex(Index++);
   }
 
   if (opts::ReorderFunctions == RT_NONE)
     return;
 
+  printStats(Clusters, FuncAddr);
+}
+
+void ReorderFunctions::printStats(const std::vector<Cluster> &Clusters,
+                                  const std::vector<uint64_t> &FuncAddr) {
   if (opts::Verbosity == 0) {
 #ifndef NDEBUG
     if (!DebugFlag || !isCurrentDebugType("hfsort"))
       return;
 #else
     return;
 #endif
   }
 
   bool PrintDetailed = opts::Verbosity > 1;
 #ifndef NDEBUG
   PrintDetailed |=
     (DebugFlag && isCurrentDebugType("hfsort") && opts::Verbosity > 0);
 #endif
-  TotalSize   = 0;
+  uint64_t TotalSize   = 0;
   uint64_t CurPage     = 0;
   uint64_t Hotfuncs    = 0;
   double TotalDistance = 0;
   double TotalCalls    = 0;
   double TotalCalls64B = 0;
   double TotalCalls4KB = 0;
   double TotalCalls2MB = 0;
   if (PrintDetailed)
     outs() << "BOLT-INFO: Function reordering page layout\n"
            << "BOLT-INFO: ============== page 0 ==============\n";
-  for (Cluster &Cluster : Clusters) {
+  for (const Cluster &Cluster : Clusters) {
     if (PrintDetailed)
       outs() << format(
           "BOLT-INFO: -------- density = %.3lf (%u / %u) --------\n",
           Cluster.density(), Cluster.samples(), Cluster.size());
 
     for (NodeId FuncId : Cluster.targets()) {
       if (Cg.samples(FuncId) > 0) {
         Hotfuncs++;