[BOLT] Set RawBranchCount in DataAggregator

Align DataAggregator (Linux perf and pre-aggregated profile reader) to
DataReader (fdata profile reader) behavior: set BF->RawBranchCount which
is used in profile density computation (llvm#101094).

Reviewers: ayermolo, maksfb, dcci, rafaelauler, WenleiHe

Reviewed By: WenleiHe

Pull Request: llvm#101093

bolt/lib/Profile/DataAggregator.cpp

@@ -638,8 +638,12 @@ void DataAggregator::processProfile(BinaryContext &BC) {
                                             : BinaryFunction::PF_LBR;
   for (auto &BFI : BC.getBinaryFunctions()) {
     BinaryFunction &BF = BFI.second;
-    if (getBranchData(BF) || getFuncSampleData(BF.getNames()))
+    FuncBranchData *FBD = getBranchData(BF);
+    if (FBD || getFuncSampleData(BF.getNames())) {
       BF.markProfiled(Flags);
+      if (FBD)
+        BF.RawBranchCount = FBD->getNumExecutedBranches();
+    }
   }
 
   for (auto &FuncBranches : NamesToBranches)